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102-653: The island is created by a river delta of the Bojana River . It is located on the southernmost tip of Montenegro , with the Bojana river separating it from Pulaj and Velipojë in the Albanian territory. The island is of triangular shape, bordered from two sides by the Bojana river and by the Adriatic Sea from the southwest. It has an area of 4.8 square km. It is a popular place for nude tourists . Although in

204-432: A density current that deposits its sediments as turbidites . When the river water is less dense than the basin water, as is typical of river deltas on an ocean coastline, the delta is characterized by hypopycnal flow in which the river water is slow to mix with the denser basin water and spreads out as a surface fan. This allows fine sediments to be carried a considerable distance before settling out of suspension. Beds in

306-493: A common location for civilizations to flourish due to access to flat land for farming, freshwater for sanitation and irrigation , and sea access for trade. Deltas often host extensive industrial and commercial activities, and agricultural land is frequently in conflict. Some of the world's largest regional economies are located on deltas such as the Pearl River Delta , Yangtze River Delta , European Low Countries and

408-545: A delta but enter into the sea in the form of an estuary . Notable examples include the Gulf of Saint Lawrence and the Tagus estuary. In rare cases, the river delta is located inside a large valley and is called an inverted river delta . Sometimes a river divides into multiple branches in an inland area, only to rejoin and continue to the sea. Such an area is called an inland delta , and often occurs on former lake beds. The term

510-533: A fan. The more often the flow changes course, the shape develops closer to an ideal fan because more rapid changes in channel position result in a more uniform deposition of sediment on the delta front. The Mississippi and Ural River deltas, with their bird's feet, are examples of rivers that do not avulse often enough to form a symmetrical fan shape. Alluvial fan deltas, as seen by their name, avulse frequently and more closely approximate an ideal fan shape. Most large river deltas discharge to intra-cratonic basins on

612-590: A few introduced species . As the altitude further declines the Indus basin becomes overall quite slow-flowing as it passes through the Punjab Plain . Major carp become common, and chameleonfish ( Badis ), mullet ( Sicamugil ) and swamp eel ( Monopterus ) appear. In some upland lakes and tributaries of the Punjab region snow trout and mahseer are still common, but once the Indus basin reaches its lower plain

714-399: A few main distributaries. Once a wave-dominated or river-dominated distributary silts up, it is abandoned, and a new channel forms elsewhere. In a tidal delta, new distributaries are formed during times when there is a lot of water around – such as floods or storm surges . These distributaries slowly silt up at a more or less constant rate until they fizzle out. A tidal freshwater delta is

816-545: A flat arid area splits into channels that evaporate as it progresses into the desert. The Okavango Delta in Botswana is one example. See endorheic basin . The generic term mega delta can be used to describe very large Asian river deltas, such as the Yangtze , Pearl , Red , Mekong , Irrawaddy , Ganges-Brahmaputra , and Indus . The formation of a delta is complicated, multiple, and cross-cutting over time, but in

918-552: A greater volume of water than the Indus itself before that point. An alternative reckoning begins the river around 300 km further upstream, at the confluence of the Sênggê Zangbo and Gar Tsangpo rivers, which drain the Nganglong Kangri and Gangdise Shan (Gang Rinpoche, Mt. Kailash) mountain ranges. The 2011 remeasurement suggested the source was a small lake northeast of Mount Kailash, rather than either of

1020-573: A hypocynal delta dip at a very shallow angle, around 1 degree. Fluvial-dominated deltas are further distinguished by the relative importance of the inertia of rapidly flowing water, the importance of turbulent bed friction beyond the river mouth, and buoyancy . Outflow dominated by inertia tends to form Gilbert-type deltas. Outflow dominated by turbulent friction is prone to channel bifurcation, while buoyancy-dominated outflow produces long distributaries with narrow subaqueous natural levees and few channel bifurcations. The modern Mississippi River delta

1122-565: A major role in earlier cultures of the region, including the ancient Indus Valley Civilisation where depictions of fish were frequent. The Indus script has a commonly used fish sign, which in its various forms may simply have meant "fish", or referred to stars or gods. In the uppermost, highest part of the Indus River basin there are relatively few genera and species: Diptychus , Ptychobarbus , Schizopyge , Schizopygopsis and Schizothorax snowtrout, Triplophysa loaches, and

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1224-439: A mature delta with a distributary network. Another way these distributary networks form is from the deposition of mouth bars (mid-channel sand and/or gravel bars at the mouth of a river). When this mid-channel bar is deposited at the mouth of a river, the flow is routed around it. This results in additional deposition on the upstream end of the mouth bar, which splits the river into two distributary channels. A good example of

1326-643: A mountain spring and fed with glaciers and rivers in the Himalayan , Karakoram , and Hindu Kush ranges, the river supports the ecosystems of temperate forests , plains, and arid countryside. The northern part of the Indus Valley, with its tributaries, forms the Punjab region of South Asia, while the lower course of the river ends in a large delta in the southern Sindh province of Pakistan. The river has historically been important to many cultures of

1428-423: A sedimentary deposit formed at the boundary between an upland stream and an estuary, in the region known as the "subestuary". Drowned coastal river valleys that were inundated by rising sea levels during the late Pleistocene and subsequent Holocene tend to have dendritic estuaries with many feeder tributaries. Each tributary mimics this salinity gradient from its brackish junction with the mainstem estuary up to

1530-447: A simple delta three main types of bedding may be distinguished: the bottomset beds, foreset/frontset beds, and topset beds. This three-part structure may be seen on small scale by crossbedding . Human activities in both deltas and the river basins upstream of deltas can radically alter delta environments. Upstream land use change such as anti-erosion agricultural practices and hydrological engineering such as dam construction in

1632-566: Is "sindhu". In Sanskrit, its range of meanings includes: stream, river; Indus; flood; sea or ocean; region or country in the vicinity of the Indus, Sindh, people of Sindh." The modern name in Urdu is Sindh ( Urdu : سندھ ) or Daryā-i-Sindh ( Urdu : دریائے سندھ , lit.   'The River Sindh'), contrasting to the Province of Sindh ( Urdu : صوبہِ سندھ , romanized :  Sūba-i-sindh ). The Ladakhis and Tibetans call

1734-502: Is a fertile region and often called the "breadbasket" of the country; the damage and toll of the floods on the local agrarian economy was said to be extensive. At least 1.7 million acres (690,000 ha; 2,700 sq mi) of arable land were inundated. The flooding followed the previous year's floods, which devastated a large part of the country. Unprecedented torrential monsoon rains caused severe flooding in 16 districts of Sindh. In Pakistan currently there are six barrages on

1836-551: Is a good example of a fluvial-dominated delta whose outflow is buoyancy-dominated. Channel abandonment has been frequent, with seven distinct channels active over the last 5000 years. Other fluvial-dominated deltas include the Mackenzie delta and the Alta delta. A Gilbert delta (named after Grove Karl Gilbert ) is a type of fluvial-dominated delta formed from coarse sediments, as opposed to gently sloping muddy deltas such as that of

1938-570: Is a major sign that Mars once had large amounts of water. Deltas have been found over a wide geographical range. Below are pictures of a few. Indus valley This is an accepted version of this page The Indus ( / ˈ ɪ n d ə s / IN -dəs ) is a transboundary river of Asia and a trans- Himalayan river of South and Central Asia . The 3,180 km (1,980 mi) river rises in mountain springs northeast of Mount Kailash in Western Tibet , flows northwest through

2040-424: Is a triangular landform created by the deposition of the sediments that are carried by the waters of a river , where the river merges with a body of slow-moving water or with a body of stagnant water. The creation of a river delta occurs at the river mouth , where the river merges into an ocean , a sea , or an estuary , into a lake , a reservoir , or (more rarely) into another river that cannot carry away

2142-591: Is called by the Ionians ", including describing the outflow of silt into the sea and the convexly curved seaward side of the triangle. Despite making comparisons to other river systems deltas, Herodotus did not describe them as "deltas". The Greek historian Polybius likened the land between the Rhône and Isère rivers to the Nile Delta, referring to both as islands, but did not apply the word delta. According to

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2244-401: Is derived from the Indus River. In ancient times, "India" initially referred to those regions immediately along the east bank of the Indus, where are Punjab and Sindh now but by 300 BC, Greek writers including Herodotus and Megasthenes were applying the term to the entire subcontinent that extends much farther eastward. The lower basin of the Indus forms a natural boundary between

2346-683: Is especially critical since rainfall is meagre in the lower Indus valley. Irrigation canals were first built by the people of the Indus Valley civilisation , and later by the engineers of the Kushan Empire and the Mughal Empire . Modern irrigation was introduced by the British East India Company in 1850 – the construction of modern canals accompanied with the restoration of old canals. The British supervised

2448-408: Is prone to moderate to severe flooding. In July 2010, following abnormally heavy monsoon rains, the Indus River rose above its banks and started flooding. The rain continued for the next two months, devastating large areas of Pakistan. In Sindh , the Indus burst its banks near Sukkur on 8 August, submerging the village of Mor Khan Jatoi. In early August, the heaviest flooding moved southward along

2550-458: Is protected from river flooding by constructing around 600 km long levees . The right bank side is also leveed from Guddu barrage to Lake Manchar . In response to the levees construction, the river has been aggrading rapidly over the last 20 years leading to breaches upstream of barrages and inundation of large areas. Tarbela Dam in Pakistan is constructed on the Indus River, while

2652-548: Is so named because the shape of the Nile Delta approximates the triangular uppercase Greek letter delta . The triangular shape of the Nile Delta was known to audiences of classical Athenian drama ; the tragedy Prometheus Bound by Aeschylus refers to it as the "triangular Nilotic land", though not as a "delta". Herodotus 's description of Egypt in his Histories mentions the Delta fourteen times, as "the Delta, as it

2754-451: Is the "largest contiguous irrigation system developed over the past 140 years" anywhere in the world. This has reduced the flow of water and by 2018, the average annual flow of water below the Kotri barrage was 33 billion cubic metres (43 × 10 ^  cu yd), and annual amount of silt discharged was estimated at 100 million tonnes (98 × 10 ^ long tons). As a result,

2856-542: The 1819 Rann of Kutch earthquake . The Induan Age at the start of the Triassic Period of geological time is named for the Indus region. Accounts of the Indus valley from the times of Alexander's campaign indicate a healthy forest cover in the region. The Mughal Emperor Babur writes of encountering rhinoceroses along its bank in his memoirs (the Baburnama ). Extensive deforestation and human interference in

2958-433: The 2010 Pakistan floods were considered "good news" for the ecosystem and population of the river delta as they brought much-needed fresh water. Any further utilization of the river basin water is not economically feasible. Vegetation and wildlife of the Indus delta are threatened by the reduced inflow of fresh water, along with extensive deforestation, industrial pollution and global warming . Damming has also isolated

3060-662: The Greater Tokyo Area . The Ganges–Brahmaputra Delta , which spans most of Bangladesh and West Bengal and empties into the Bay of Bengal , is the world's largest delta. The Selenga River delta in the Russian republic of Buryatia is the largest delta emptying into a body of fresh water, in its case Lake Baikal . Researchers have found a number of examples of deltas that formed in Martian lakes . Finding deltas

3162-761: The Iranian Plateau and the Indian subcontinent ; this region embraces all or parts of the Pakistani provinces Balochistan , Khyber Pakhtunkhwa , Punjab and Sindh and the countries Afghanistan and India. The first West Eurasian empire to annex the Indus Valley was the Persian Empire , during the reign of Darius the Great . During his reign, the Greek explorer Scylax of Caryanda was commissioned to explore

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3264-671: The Jhelum River to Ropar on the upper Sutlej. The coastal settlements extended from Sutkagan Dor at the Pakistan- Iran border to Kutch in modern Gujarat , India. There is an Indus site on the Amu Darya at Shortughai in northern Afghanistan, and the Indus site Alamgirpur at the Hindon River is located only 28 km (17 mi) from Delhi. As of now, over 1,052 cities and settlements have been found, mainly in

3366-691: The Nanga Parbat massif . It flows swiftly across Hazara and is dammed at the Tarbela Reservoir . The Kabul River joins it near Attock . The remainder of its route to the sea is in the plains of the Punjab and Sindh, where the flow of the river becomes slow and highly braided. It is joined by the Panjnad at Mithankot . Beyond this confluence, the river, at one time, was named the Satnad River ( sat = "seven", nadī = "river"), as

3468-532: The Nile Delta and Colorado River Delta are some of the most extreme examples of the devastation caused to deltas by damming and diversion of water. Historical data documents show that during the Roman Empire and Little Ice Age (times when there was considerable anthropogenic pressure), there was significant sediment accumulation in deltas. The industrial revolution has only amplified the impact of humans on delta growth and retreat. Ancient deltas benefit

3570-551: The Taunsa Barrage near Dera Ghazi Khan which also produces 100,000 kilowatts of electricity. The Kotri Barrage near Hyderabad is 915 metres (3,000 ft) long and provides additional water supplies for Karachi. The extensive linking of tributaries with the Indus has helped spread water resources to the valley of Peshawar , in the Khyber Pakhtunkhwa . The extensive irrigation and dam projects provide

3672-487: The 1909 The Imperial Gazetteer of India gave it as "just over 1,800 miles". A shorter figure of 2,880 km (1,790 mi) has been widely used in modern sources, as has the one of 3,180 km (1,980 mi). The modern Encyclopedia Britannica was originally published in 1999 with the shorter measurement, but was updated in 2015 to use the longer measurement. Both lengths are commonly found in modern publications; in some cases, both measurements can be found within

3774-734: The 50 largest rivers in the world in terms of average annual flow . Its left-bank tributary in Ladakh is the Zanskar River , and its left-bank tributary in the plains is the Panjnad River which is formed by the successive confluences of the five Punjab rivers, namely the Chenab , Jhelum , Ravi , Beas , and Sutlej rivers. Its principal right-bank tributaries are the Shyok , Gilgit , Kabul , Kurram , and Gomal rivers. Beginning in

3876-596: The Greek geographer Strabo , the Cynic philosopher Onesicritus of Astypalaea , who accompanied Alexander the Great 's conquests in India , reported that Patalene (the delta of the Indus River ) was "a delta" ( Koinē Greek : καλεῖ δὲ τὴν νῆσον δέλτα , romanized:  kalei de tēn nēson délta , lit.   'he calls the island a delta'). The Roman author Arrian 's Indica states that "the delta of

3978-555: The Himalayas and entrenched itself while they were rising. The Indus River feeds the Indus submarine fan , which is the second largest sediment body on Earth. It consists of around 5 million cubic kilometres of material eroded from the mountains. Studies of the sediment in the modern river indicate that the Karakoram Mountains in northern Pakistan and India are the single most important source of material, with

4080-533: The Himalayas providing the next largest contribution, mostly via the large rivers of the Punjab (Jhelum, Ravi, Chenab, Beas and Sutlej). Analysis of sediments from the Arabian Sea has demonstrated that before five million years ago the Indus was not connected to these Punjab rivers which instead flowed east into the Ganga and were captured after that time. Earlier work showed that sand and silt from western Tibet

4182-413: The Indus River "could very well precipitate World War III." Over the years factories on the banks of the Indus River have increased levels of water pollution in the river and the atmosphere around it. High levels of pollutants in the river have led to the deaths of endangered Indus river dolphin. The Sindh Environmental Protection Agency has ordered polluting factories around the river to shut down under

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4284-701: The Indus River and its two tributaries the Jhelum River and the Chenab River independently of upstream control by India. The Indus Basin Project consisted primarily of the construction of two main dams, the Mangla Dam built on the Jhelum River and the Tarbela Dam constructed on the Indus River, together with their subsidiary dams. The Pakistan Water and Power Development Authority undertook

4386-552: The Indus River basin: the Eurasian otter in the northeastern highland sections and the smooth-coated otter elsewhere in the river basin. The smooth-coated otters in the Indus River represent a subspecies found nowhere else, the Sindh otter ( Lutrogale perspicillata sindica ). The Indus River basin has high diversity, being the home of more than 180 freshwater fish species, including 22 which are found nowhere else. Fish also played

4488-643: The Indus River from severely affected northern regions toward western Punjab , where at least 1,400,000 acres (570,000 ha) of cropland was destroyed, and the southern province of Sindh. As of September 2010 , over two thousand people had died and over a million homes had been destroyed since the flooding began. The 2011 Sindh floods began during the Pakistani monsoon season in mid-August 2011, resulting from heavy monsoon rains in Sindh, eastern Balochistan, and southern Punjab. The floods caused considerable damage; an estimated 434 civilians were killed, with 5.3 million people and 1,524,773 homes affected. Sindh

4590-587: The Indus River. It is a subspecies of the South Asian river dolphin . The Indus river dolphin formerly also occurred in the tributaries of the Indus river. According to the World Wildlife Fund it is one of the most threatened cetaceans with only about 1,816 still existing. It is threatened by habitat degradation from the construction of dams and canals, entanglement in fishing gear, and industrial water pollution. There are two otter species in

4692-481: The Indus river. Most scholars believe that settlements of Gandhara grave culture of the early Indo-Aryans flourished in Gandhara from 1700 BC to 600 BC, when Mohenjo-daro and Harappa had already been abandoned. The Rigveda describes several rivers , including one named "Sindhu". The Rigvedic "Sindhu" is thought to be the present-day Indus River. It is attested 176 times in its text, 94 times in

4794-632: The Indus: Guddu Barrage , Sukkur Barrage , Kotri Barrage (also called Ghulam Muhammad barrage), Taunsa Barrage , Chashma Barrage and Jinnah Barrage . Another new barrage called " Sindh Barrage " is planned as a terminal barrage on the Indus River. There are some bridges on River Indus, such as Dadu Moro Bridge, Larkana Khairpur Indus River Bridge, Thatta-Sujawal bridge, Jhirk-Mula Katiar bridge and recently planned Kandhkot-Ghotki bridge. The entire left bank of Indus river in Sind province

4896-641: The Mediterranean region, Ada's dominant climate is subtropical. It is a popular tourist destination, with a 3 kilometres (2 miles) long sandy beach with traditional seafood restaurants. Its main income comes from camping. The New York Times included Ada Bojana and Montenegro's South Coast (including Velika Plaža and Hotel Mediteran ) in their top travel destinations for 2010 – "Top Places to Go in 2010". 41°51′45″N 19°21′40″E  /  41.86250°N 19.36111°E  / 41.86250; 19.36111 River delta A river delta

4998-503: The Mississippi. For example, a mountain river depositing sediment into a freshwater lake would form this kind of delta. It is commonly a result of homopycnal flow. Such deltas are characterized by a tripartite structure of topset, foreset, and bottomset beds. River water entering the lake rapidly deposits its coarser sediments on the submerged face of the delta, forming steeping dipping foreset beds. The finer sediments are deposited on

5100-605: The Pakistan Environmental Protection Act, 1997. Death of the Indus river dolphin has also been attributed to fishermen using poison to kill fish and scooping them up. As a result, the government banned fishing from Guddu Barrage to Sukkur . The Indus is second among a group of ten rivers responsible for about 90% of all the plastic that reaches the oceans. The Yangtze is the only river contributing more plastic. Frequently, Indus River

5202-534: The Rann of Kutch during its floods breaching flood banks . The major cities of the Indus Valley Civilisation , such as Harappa and Mohenjo-daro , date back to around 3300 BC, and represent some of the largest human habitations of the ancient world. The Indus Valley Civilisation extended from across northeast Afghanistan to Pakistan and northwest India , with an upward reach from east of

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5304-675: The River Indus" from Achaemenian Old Persian "hindu," denoting an eastern province of the Achaemenid empire ( Persian language hind India), and Avestan hiṇdu , həṇdu "river," (natural) frontier; with same Proto Indo-Iranian language -root as Sanskrit sindhu (river), specifically the River Indus; hence also the region of the Indus, the province Sindh (which also developed into Hellenistic Greek Σίνθος ("the River Indus"). This river's traditional name in Sanskrit and Tibetan

5406-574: The Ror dynasty of Sauvīra . The Indus River came into the knowledge of the Western world early in the classical period , when King Darius of Persia sent his Greek subject Scylax of Caryanda to explore the river, c.  515 BC . Etymologically, English language word "Indus" comes from Late Latin Indus (1598), specifically a use of classical Latin Indus (inhabitant of India, Indian) from ancient Greek Ἰνδός "inhabitant of India, Indian,

5508-472: The ability to pile up and accumulate due to the sediment traveling into a steep subduction trench rather than a shallow continental shelf . There are many other lesser factors that could explain why the majority of river deltas form along passive margins rather than active margins. Along active margins, orogenic sequences cause tectonic activity to form over-steepened slopes, brecciated rocks, and volcanic activity resulting in delta formation to exist closer to

5610-1256: The basins feeding deltas have reduced river sediment delivery to many deltas in recent decades. This change means that there is less sediment available to maintain delta landforms, and compensate for erosion and sea level rise , causing some deltas to start losing land. Declines in river sediment delivery are projected to continue in the coming decades. The extensive anthropogenic activities in deltas also interfere with geomorphological and ecological delta processes. People living on deltas often construct flood defences which prevent sedimentation from floods on deltas, and therefore means that sediment deposition can not compensate for subsidence and erosion . In addition to interference with delta aggradation , pumping of groundwater , oil , and gas , and constructing infrastructure all accelerate subsidence , increasing relative sea level rise. Anthropogenic activities can also destabilise river channels through sand mining , and cause saltwater intrusion . There are small-scale efforts to correct these issues, improve delta environments and increase environmental sustainability through sedimentation enhancing strategies . While nearly all deltas have been impacted to some degree by humans,

5712-561: The basis for Pakistan's large production of crops such as cotton, sugarcane and wheat. The dams also generate electricity for heavy industries and urban centres. The Indus River is sacred to Hindus. The Sindhu Darshan Festival is held on every Guru Purnima on the banks of the Indus. The ethnicities of the Indus Valley (Pakistan and Northwest India) have a greater amount of ANI (or West Eurasian) admixture than other South Asians, including inputs from Western Steppe Herders , with evidence of more sustained and multi-layered migrations from

5814-422: The bird's-foot of the Mississippi or Ural river deltas), pushing its mouth into the standing water. As the deltaic lobe advances, the gradient of the river channel becomes lower because the river channel is longer but has the same change in elevation (see slope ). As the gradient of the river channel decreases, the amount of shear stress on the bed decreases, which results in the deposition of sediment within

5916-1454: The catfish Glyptosternon reticulatum . Going downstream these are soon joined by the golden mahseer Tor putitora (alternatively T. macrolepis , although it often is regarded as a synonym of T. putitora ) and Schistura loaches. Downriver from around Thakot , Tarbela , the Kabul –Indus river confluence, Attock Khurd and Peshawar the diversity rises strongly, including many cyprinids ( Amblypharyngodon , Aspidoparia , Barilius , Chela , Cirrhinus , Crossocheilus , Cyprinion , Danio , Devario , Esomus , Garra , Labeo , Naziritor , Osteobrama , Pethia , Puntius , Rasbora , Salmophasia , Securicula and Systomus ), true loaches ( Botia and Lepidocephalus ), stone loaches ( Acanthocobitis and Nemacheilus ), ailiid catfish ( Clupisoma ), bagridae catfish ( Batasio , Mystus , Rita and Sperata ), airsac catfish ( Heteropneustes ), schilbid catfish ( Eutropiichthys ), silurid catfish ( Ompok and Wallago ), sisorid catfish ( Bagarius , Gagata , Glyptothorax and Sisor ), gouramis ( Trichogaster ), nandid leaffish ( Nandus ), snakeheads ( Channa ), spiny eel ( Macrognathus and Mastacembelus ), knifefish ( Notopterus ), glassfish ( Chanda and Parambassis ), clupeids ( Gudusia ), needlefish ( Xenentodon ) and gobies ( Glossogobius ), as well as

6018-450: The channel and a rise in the channel bed relative to the floodplain . This destabilizes the river channel. If the river breaches its natural levees (such as during a flood), it spills out into a new course with a shorter route to the ocean, thereby obtaining a steeper, more stable gradient. Typically, when the river switches channels in this manner, some of its flow remains in the abandoned channel. Repeated channel-switching events build up

6120-422: The construction of one of the most complex irrigation networks in the world. The Guddu Barrage is 1,350 m (4,430 ft) long – irrigating Sukkur , Jacobabad , Larkana and Kalat . The Sukkur Barrage serves over 20,000 km (7,700 sq mi). After Pakistan came into existence, a water control treaty signed between India and Pakistan in 1960 guaranteed that Pakistan would receive water from

6222-585: The construction of the Chashma-Jhelum link canal – linking the waters of the Indus and Jhelum rivers – extending water supplies to the regions of Bahawalpur and Multan . Pakistan constructed the Tarbela Dam near Rawalpindi – standing 2,743 metres (9,000 ft) long and 143 metres (470 ft) high, with an 80-kilometre (50 mi) long reservoir. It supports the Chashma Barrage near Dera Ismail Khan for irrigation use and flood control and

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6324-632: The course of the Indus. It was crossed by the invading armies of Alexander . Still, after his Macedonians conquered the west bank—joining it to the Hellenic world, they elected to retreat along the southern course of the river, ending Alexander's Asian campaign. Alexander's admiral Nearchus set out from the Indus Delta to explore the Persian Gulf , until reaching the Tigris . The Indus Valley

6426-459: The delta population of Indus River dolphins from those further upstream. Large-scale diversion of the river's water for irrigation has raised far-reaching issues. Sediment clogging from poor maintenance of canals has affected agricultural production and vegetation on numerous occasions. Irrigation itself is increasing soil salinization, reducing crop yields and in some cases rendering farmland useless for cultivation. The Tibetan Plateau contains

6528-460: The disputed region of Kashmir , bends sharply to the left after the Nanga Parbat massif , and flows south-by-southwest through Pakistan , before emptying into the Arabian Sea near the port city of Karachi . The river has a total drainage area of circa 1,120,000 km (430,000 sq mi). Its estimated annual flow is around 175 km /a (5,500 m /s), making it one of

6630-399: The ecology of the Shivalik Hills has led to a marked deterioration in vegetation and growing conditions. The Indus valley regions are arid with poor vegetation. Agriculture is sustained largely due to irrigation works. The Indus river and its watershed have a rich biodiversity. It is home to around 25 amphibian species. The Indus river dolphin ( Platanista indicus minor ) is found only in

6732-556: The economy due to their well-sorted sand and gravel . Sand and gravel are often quarried from these old deltas and used in concrete for highways , buildings, sidewalks, and landscaping. More than 1 billion tons of sand and gravel are produced in the United States alone. Not all sand and gravel quarries are former deltas, but for ones that are, much of the sorting is already done by the power of water. Urban areas and human habitation tend to be located in lowlands near water access for transportation and sanitation . This makes deltas

6834-418: The five rivers are Jhelum , Chenab , Ravi , Beas and Sutlej , all of which finally flow into the Indus. The Indus also supports many heavy industries and provides the main supply of potable water in Pakistan. The total length of the river varies in different sources. The length used in this article is 3,180 km (1,980 mi), taken from the Himalayan Climate and Water Atlas (2015). Historically,

6936-414: The flow enters the standing water, it is no longer confined to its channel and expands in width. This flow expansion results in a decrease in the flow velocity , which diminishes the ability of the flow to transport sediment . As a result, sediment drops out of the flow and is deposited as alluvium , which builds up to form the river delta. Over time, this single channel builds a deltaic lobe (such as

7038-517: The flows of the Indus could be severely, severely affected by glacier melt as a consequence of climate change ," and reduced by perhaps as much as 50 per cent. "Now what does that mean to a population that lives in a desert [where], without the river, there would be no life? I don't know the answer to that question," he says. "But we need to be concerned about that. Deeply, deeply concerned." U.S. diplomat Richard Holbrooke said, shortly before he died in 2010, that he believed that falling water levels in

7140-452: The former group is absent and the latter are rare. Many of the species of the middle sections of the Indus basin are also present in the lower. Notable examples of genera that are present in the lower plain but generally not elsewhere in the Indus River basin are the Aphanius pupfish, Aplocheilus killifish, palla fish ( Tenualosa ilisha ), catla ( Labeo catla ), rohu ( Labeo rohita ) and Cirrhinus mrigala . The lowermost part of

7242-506: The fresh stream feeding the head of tidal propagation. As a result, the tributaries are considered to be "subestuaries". The origin and evolution of a tidal freshwater delta involves processes that are typical of all deltas as well as processes that are unique to the tidal freshwater setting. The combination of processes that create a tidal freshwater delta result in a distinct morphology and unique environmental characteristics. Many tidal freshwater deltas that exist today are directly caused by

7344-491: The general region of the Ghaggar-Hakra River and its tributaries. Among the settlements were the major urban centres of Harappa and Mohenjo-daro, as well as Lothal , Dholavira , Ganeriwala , and Rakhigarhi . Only 40 Indus Valley sites have been discovered on the Indus and its tributaries. However, it is notable that majority of the Indus script seals and inscribed objects discovered were found at sites along

7446-466: The geomorphology and ecosystem. Deltas are typically classified according to the main control on deposition, which is a combination of river, wave , and tidal processes, depending on the strength of each. The other two factors that play a major role are landscape position and the grain size distribution of the source sediment entering the delta from the river. Fluvial-dominated deltas are found in areas of low tidal range and low wave energy. Where

7548-406: The lake bottom beyond this steep slope as more gently dipping bottomset beds. Behind the delta front, braided channels deposit the gently dipping beds of the topset on the delta plain. While some authors describe both lacustrine and marine locations of Gilbert deltas, others note that their formation is more characteristic of the freshwater lakes, where it is easier for the river water to mix with

7650-594: The lakewater faster (as opposed to the case of a river falling into the sea or a salt lake, where less dense fresh water brought by the river stays on top longer). Gilbert himself first described this type of delta on Lake Bonneville in 1885. Elsewhere, similar structures occur, for example, at the mouths of several creeks that flow into Okanagan Lake in British Columbia and form prominent peninsulas at Naramata , Summerland , and Peachland . In wave-dominated deltas, wave-driven sediment transport controls

7752-532: The land of the Indians is made by the Indus river no less than is the case with that of Egypt". As a generic term for the landform at the mouth of the river, the word delta is first attested in the English-speaking world in the late 18th century, in the work of Edward Gibbon . River deltas form when a river carrying sediment reaches a body of water, such as a lake, ocean, or a reservoir . When

7854-587: The onset of or changes in historical land use, especially deforestation , intensive agriculture , and urbanization . These ideas are well illustrated by the many tidal freshwater deltas prograding into Chesapeake Bay along the east coastline of the United States. Research has demonstrated that the accumulating sediments in this estuary derive from post-European settlement deforestation, agriculture, and urban development. Other rivers, particularly those on coasts with significant tidal range , do not form

7956-512: The plural, and most often used in the generic sense of "river". In the Rigveda, notably in the later hymns, the meaning of the word is narrowed to refer to the Indus river in particular; for example, in the list of rivers mentioned in the hymn of Nadistuti sukta . The Rigvedic hymns apply a feminine gender to all the rivers mentioned therein, except for the Brahmaputra . The word "India"

8058-565: The region. The 3rd millennium BC saw the rise of Indus Valley Civilisation , a major urban civilization of the Bronze Age. During the 2nd millennium BC, the Punjab region was mentioned in the Rigveda hymns as Sapta Sindhu and in the Avesta religious texts as Hapta Həndu (both terms meaning " seven rivers "). Early historical kingdoms that arose in the Indus Valley include Gandhāra , and

8160-487: The result of this process is the Wax Lake Delta . In both of these cases, depositional processes force redistribution of deposition from areas of high deposition to areas of low deposition. This results in the smoothing of the planform (or map-view) shape of the delta as the channels move across its surface and deposit sediment. Because the sediment is laid down in this fashion, the shape of these deltas approximates

8262-461: The river Senge Tsangpo (སེང་གེ་གཙང་པོ།), Baltis call it Gemtsuh and Tsuh-Fo , Pashtuns call it Nilab , Sher Darya and Abbasin , while Sindhis call it Sindhu , Mehran , Purali and Samundar . The Indus River provides key water resources for Pakistan's economy – especially the breadbasket of Punjab province , which accounts for most of the nation's agricultural production, and Sindh. The word Punjab means "land of five rivers" and

8364-412: The river and its delta are home to freshwater fish, but also several brackish and marine species. This includes pomfret and prawns . The large delta has been recognized by conservationists as an important ecological region. Here, the river turns into many marshes, streams and creeks and meets the sea at shallow levels. Palla fish ( Tenualosa ilisha ) of the river is a delicacy for people living along

8466-579: The river delta, causing the delta to retreat. For deltas that form further upriver in an estuary, there are complex yet quantifiable linkages between winds, tides, river discharge, and delta water levels. Erosion is also an important control in tide-dominated deltas, such as the Ganges Delta , which may be mainly submarine, with prominent sandbars and ridges. This tends to produce a "dendritic" structure. Tidal deltas behave differently from river-dominated and wave-dominated deltas, which tend to have

8568-457: The river is also determined by the seasons – it diminishes greatly in the winter while flooding its banks in the monsoon months from July to September. There is also evidence of a steady shift in the course of the river since prehistoric times – it deviated westwards from flowing into the Rann of Kutch and adjoining Banni grasslands after the 1816 earthquake. As of 2011 , Indus water flows in to

8670-524: The river is the Sênggê Kanbab ( Sênggê Zangbo ) or "Lion's Mouth", a perennial spring not far from the sacred Mount Kailash , marked by a long low line of Tibetan chortens . There are several other tributaries nearby, which may form a longer stream than Sênggê Kanbab, but unlike the Sênggê Kanbab, are all dependent on snowmelt . The Zanskar River , which flows into the Indus in Ladakh, has

8772-688: The river now carried the waters of the Kabul River, the Indus River and the five Punjab rivers. Passing by Jamshoro , it ends in a large delta to the South of Thatta in the Sindh province of Pakistan. The Indus is one of the few rivers in the world to exhibit a tidal bore . The Indus system is largely fed by the snow and glaciers of the Himalayas , Karakoram and the Hindu Kush ranges. The flow of

8874-414: The river water is nearly equal in density to the basin water, the delta is characterized by homopycnal flow , in which the river water rapidly mixes with basin water and abruptly dumps most of its sediment load. Where the river water has a higher density than basin water, typically from a heavy load of sediment, the delta is characterized by hyperpycnal flow in which the river water hugs the basin bottom as

8976-436: The river. The population of fish in the river is moderately high, with Sukkur , Thatta , and Kotri being the major fishing centres – all in the lower Sindh course. As a result, damming and irrigation have made fish farming an important economic activity. The Indus is the most important supplier of water resources to the Punjab and Sindh plains – it forms the backbone of agriculture and food production in Pakistan. The river

9078-479: The same work. An extended figure of circa 3,600 km (2,200 mi) was announced by a Chinese research group in 2011, based on a comprehensive remeasurement from satellite imagery, and a ground expedition to identify an alternative source point, but detailed analysis has not yet been published. The ultimate source of the Indus is in Tibet , but there is some debate about the exact source. The traditional source of

9180-399: The sediment is never piled up in thick sequences due to the sediment traveling and depositing in deep subduction trenches. At the mouth of a river, the change in flow conditions can cause the river to drop any sediment it is carrying. This sediment deposition can generate a variety of landforms, such as deltas, sand bars, spits, and tie channels. Landforms at the river mouth drastically alter

9282-514: The sediment source. When sediment does not travel far from the source, sediments that build up are coarser grained and more loosely consolidated, therefore making delta formation more difficult. Tectonic activity on active margins causes the formation of river deltas to form closer to the sediment source which may affect channel avulsion , delta lobe switching, and auto cyclicity. Active margin river deltas tend to be much smaller and less abundant but may transport similar amounts of sediment. However,

9384-814: The sediment supplied by the feeding river. Etymologically, the term river delta derives from the triangular shape (Δ) of the uppercase Greek letter delta . In hydrology , the dimensions of a river delta are determined by the balance between the watershed processes that supply sediment and the watershed processes that redistribute, sequester, and export the supplied sediment into the receiving basin. River deltas are important in human civilization , as they are major agricultural production centers and population centers. They can provide coastline defence and can impact drinking water supply. They are also ecologically important, with different species' assemblages depending on their landscape position. On geologic timescales , they are also important carbon sinks . A river delta

9486-424: The shape of the delta, and much of the sediment emanating from the river mouth is deflected along the coastline. The relationship between waves and river deltas is quite variable and largely influenced by the deepwater wave regimes of the receiving basin. With a high wave energy near shore and a steeper slope offshore, waves will make river deltas smoother. Waves can also be responsible for carrying sediments away from

9588-561: The surface. In November 2011, satellite images showed that the Indus river had re-entered India and was feeding the Great Rann of Kutch , Little Rann of Kutch and a lake near Ahmedabad known as Nal Sarovar . Heavy rains had left the river basin along with the Lake Manchar , Lake Hemal and Kalri Lake (all in modern-day Pakistan) inundated. This happened two centuries after the Indus river shifted its course westwards following

9690-656: The trailing edges of passive margins due to the majority of large rivers such as the Mississippi , Nile , Amazon , Ganges , Indus , Yangtze , and Yellow River discharging along passive continental margins. This phenomenon is due mainly to three factors: topography , basin area, and basin elevation. Topography along passive margins tend to be more gradual and widespread over a greater area enabling sediment to pile up and accumulate over time to form large river deltas. Topography along active margins tends to be steeper and less widespread, which results in sediments not having

9792-530: The two points previously used. The Indus then flows northwest through Ladakh (Indian-administered Kashmir) and Baltistan and Gilgit (Pakistan-administered Kashmir), just south of the Karakoram range. The Shyok , Shigar and Gilgit rivers carry glacial waters into the main river. It gradually bends to the south and descends into the Punjab plains at Kalabagh , Pakistan. The Indus passes gigantic gorges 4,500–5,200 metres (15,000–17,000 ft) deep near

9894-480: The west. Originally, the delta used to receive almost all of the water from the Indus River, which has an annual flow of approximately 180 billion cubic metres (240 × 10 ^  cu yd), and is accompanied by 400 million tonnes (390 × 10 ^ long tons) of silt. Since the 1940s, dams, barrages and irrigation works have been constructed on the river. The Indus Basin Irrigation System

9996-662: The world's third-largest store of ice. Qin Dahe, the former head of the China Meteorological Administration, said the recent fast pace of melting and warmer temperatures will be good for agriculture and tourism in the short term, but issued a strong warning: Temperatures are rising four times faster than elsewhere in China, and the Tibetan glaciers are retreating at a higher speed than in any other part of

10098-525: The world... In the short term, this will cause lakes to expand and bring floods and mudflows... In the long run, the glaciers are vital lifelines of the Indus River. Once they vanish, water supplies in Pakistan will be in peril. "There is insufficient data to say what will happen to the Indus," says David Grey, the World Bank's senior water advisor in South Asia. "But we all have very nasty fears that

10200-732: Was first coined by Alexander von Humboldt for the middle reaches of the Orinoco River , which he visited in 1800. Other prominent examples include the Inner Niger Delta , Peace–Athabasca Delta , the Sacramento–San Joaquin River Delta , and the Sistan delta of Iran. The Danube has one in the valley on the Slovak–Hungarian border between Bratislava and Iža . In some cases, a river flowing into

10302-512: Was later dominated by the Mauryan and Kushan Empires , Indo-Greek Kingdoms , Indo-Scythians and Hepthalites . Over several centuries Muslim armies of Muhammad ibn al-Qasim , Mahmud of Ghazni , Muhammad of Ghor , Timur and Babur crossed the river to invade Sindh and Punjab , providing a gateway to the Indian subcontinent. Indus is an antecedent river , meaning that it existed before

10404-564: Was reaching the Arabian Sea by 45 million years ago, implying the existence of an ancient Indus River by that time. The delta of this proto-Indus river has subsequently been found in the Katawaz Basin , on the Afghan-Pakistan border . In the Nanga Parbat region, the massive amounts of erosion due to the Indus river following the capture and rerouting through that area are thought to bring middle and lower crustal rocks to

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