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97-556: The province is in the Mekong valley. In the west of the province are the Phu Phan mountains , which are covered with thick forests. The total forest area is 1,362 km (526 sq mi) or 33 percent of provincial area. There are a total of three national parks, of which two, along with four other national parks, make up region 9 (Ubon Ratchathani) and Phu Pha Yon in region 10 (Udon Thani) of Thailand's protected areas. There

194-493: A sacred fig tree . The larger of the two was bricks-and-mortar, while the smaller one was made of fine iron. He had a new monastery built at once in the vicinity of the old, abandoned temple, and named it Wat Sri Moungkhoun (วัดศรีมุงคุณ) (cognate to Sri Mongkol (ศรีมงคล) in Central Thai, meaning 'Temple of Serene Auspices'). He constructed a palatial manse in the vicinity of the temple where he enshrined both Buddha images in

291-471: A tray . The provincial tree and flower is Ochna integerrima . The Asian redtail catfish ( Hemibagrus wyckioides ) is the provincial aquatic life. The provincial slogan is "Skyscraping Ho Kaeo Tower, Phu Pha Thoep and Kaeng Kabao, eight ethnic minorities, famous sweet tamarind, large ancient kettledrum, origin of Lam Phaya, stunning view of the Mekong River, gateway to Indochina." The province

388-410: A vihara . Later, the iron Buddha image (the smaller one) appeared to mysteriously reestablish itself beneath the fig tree where it had first been discovered and ultimately, after some three or four spectacles of this nature, began slowly sinking into the ground there until only the crown of the head could be seen. An alternate place of worship was built there to cover the site instead and the image itself

485-517: A 10-year naming cycle (numbered one to ten). Cambodians use multiple systems to identify a given year. For instance, 2017 is identified as 2561 Buddhist Era, the year of Rooster, Nuppasak (Year 9). The Thai lunar calendar also uses a similar numbered 10-year cycle. Each number in the cycle corresponds to the last digit of the year in the Chula Sakarat calendar. The Southeast Asian Buddhist calendars use lunar months but try to keep pace with

582-789: A connection to the South China Sea. Although the hydraulic relationships between the Mekong and the Tonle Sap Great Lake systems during the Holocene are not well understood, it is clear that between 9,000 and 7,500 years ago the confluence of the Tonle Sap and the Mekong was in proximity to the South China Sea. The present river morphology of the Mekong Delta developed over the last 6,000 years. During this period,

679-476: A contracted form of Tai shortened to Mae Khong . In Thai and Lao, Mae Nam ("Mother of Water[s]") is used for large rivers and Khong is the proper name referred to as "River Khong". However, Khong is an archaic word meaning "river", loaned from Austroasiatic languages , such as Vietnamese sông (from * krong ) and Mon kruŋ "river", which led to Chinese 江 whose Old Chinese pronunciation has been reconstructed as /*kˤroŋ/ and which long served as

776-410: A day to Nayon at irregular intervals—a little more than seven times in two cycles (39 years). The intercalary day is never inserted except in a year which has an intercalary month. The Hindu calendar inserts an intercalary month at any time of year as soon as the accumulated fractions amount to one month. The Burmese calendar however always inserts the intercalary month at the same time of the year, after

873-478: A high evaporation rate means it is classified as a semi-arid region. Consequently, although the Mun and Chi basins drain 15% of the entire Mekong basin, they only contribute 6% of the average annual flow. Sandy and saline soils are the most common soil types, which makes much of the land unsuitable for wet rice cultivation. In spite of poor fertility, however, agriculture is intensive. Glutinous rice, maize, and cassava are

970-530: A huntsman crossed over the Mekong and arrived along the right bank at the mouth of the stream Bang Muk (บังมุก), where he discovered a discarded realm complete with a monastery and seven sugar palms on the nearby riverbank. He found the area much better than the territories along the left side of the Mekong, and moreover at the mouth of the Bang Muk was an abundance of fish. He reported this to his ruler, Lord Chanthakinnaree. Chanthakinnaree led his followers across

1067-468: A major distinction in the low-flow hydrology of the river. One fraction comes from melting snow in China and Tibet and the rest from over-season catchment storage in the lower basin. This has implications for the occurrence of drought conditions. For example, if runoff from melting snow in any given year is very low, then flows upstream of Vientiane - Nong Khai would be lower. In a large river system like

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1164-591: A maximum of about 4.5 m (15 ft) above present levels in the early Holocene about 8 ka. At this time the shoreline of the South China Sea almost reached Phnom Penh and cores recovered from near Angkor Borei contained sediments deposited under the influence of tides, and salt marsh and mangrove swamp deposits. Sediments deposited in the Tonle Sap Great Lake about this time (7.9–7.3 ka) also show indications of marine influence, suggesting

1261-428: A mean year of about 365.2456 days and a mean month of about 29.530496 days, if not corrected. As such, the calendar adds an intercalary month in leap years and sometimes also an intercalary day in great leap years. The intercalary month not only corrects the length of the year but also corrects the accumulating error of the month to extent of half a day. The average length of the month is further corrected by adding

1358-411: A transparent or translucent object glittering and bright spotted emerging from the seven sugar palms. It drifted in the air above the Mekong every night until near dawn when the crystal-like object would then float back into the seven trees from whence it came. Lord Chanthakinnaree named this auspicious omen Keo Mukdahan (แก้วมุกดาหาร) or the 'Pearlsmouth Crystal' as he had founded his realm on the banks of

1455-753: Is divided into seven districts ( amphoe ). The districts are further divided into 53 subdistricts ( tambon ) and 493 villages ( muban ). As of 26 November 2019 there are: one Mukdahan Provincial Administration Organisation ( ongkan borihan suan changwat ) and 25 municipal ( thesaban ) areas in the province. Mukdahan has town ( thesaban mueang ) status. Further 24 subdistrict municipalities ( thesaban tambon ). The non-municipal areas are administered by 29 Subdistrict Administrative Organisations - SAO ( ongkan borihan suan tambon ). Since 2003, United Nations Development Programme (UNDP) in Thailand has tracked progress on human development at sub-national level using

1552-477: Is flooded during the rainy season. The impact of road embankments and similar infrastructure developments on the movement of this flood water is an increasingly important consequence of development. Table 2 summarises the mean annual flows along the mainstream. The mean annual flow entering the lower Mekong from China is equivalent to a relatively modest 450 mm (18 in) depth of runoff. Downstream of Vientiane this increases to over 600 mm (24 in) as

1649-592: Is heterogeneous and active, and is the major factor controlling the course of rivers and the landscapes they carve out. The elevation of the Tibetan Plateau during the Tertiary period was an important factor in the genesis of the south-west monsoon , which is the dominant climatic control influencing the hydrology of the Mekong Basin. Understanding the nature and timing of the elevation of Tibet (and

1746-531: Is little evidence from the last 45 years of data of any systematic changes in the hydrological regime of the Mekong. The internal drainage patterns of the Mekong are unusual among those of large rivers. Most large river systems that drain the interiors of continents, such as the Amazon , Congo , and Mississippi , have relatively simple dendritic tributary networks that resemble a branching tree. Typically, such patterns develop in basins with gentle slopes where

1843-620: Is one wildlife sanctuary, along with five other wildlife sanctuaries, make up region 9 (Ubon Ratchathani) of Thailand's protected areas. Lord Chandrasuriyawongse (เจ้าจันทรสุริยวงษ์) and his followers established a settlement at Baan Luang Phonsim (บ้านหลวงโพนสิม) near the Thad Ing Hang Stupa (พระธาตุอิงฮัง) on the left bank of the Mekong River in Laos. Several decades later he died. Lord Chanthakinnaree (เจ้าจันทกินรี), his son, succeeded him as ruler. In B.E. 2310 (1767 Common Era),

1940-611: Is the last day of the month (14th or 15th waning). Because of the inaccuracy of the calendrical calculation systems, the mean and real (true) New Moons rarely coincide. The mean New Moon often precedes the real New Moon. As the Synodic lunar month is approximately 29.5 days, the calendar uses alternating months of 29 and 30 days. Various regional versions of Chula Sakarat/Burmese calendar existed across various regions of mainland Southeast Asia. Unlike Burmese systems, Kengtung, Sipsongpanna, Lan Na, Lan Xang and Sukhothai systems refer to

2037-632: Is the world's twelfth-longest river and the third-longest in Asia with an estimated length of 4,909 km (3,050 mi) and a drainage area of 795,000 km (307,000 sq mi), discharging 475 km (114 cu mi) of water annually. From its headwaters in the Tibetan Plateau , the river runs through Southwest China (where it is officially called the Lancang River ), Myanmar , Laos , Thailand , Cambodia , and southern Vietnam . The extreme seasonal variations in flow and

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2134-610: Is to synchronize the lunar part with the solar part. The lunar months, normally twelve of them, consist alternately of 29 days and 30 days, such that a normal lunar year will contain 354 days, as opposed to the solar year of ~365.25 days. Therefore, some form of addition to the lunar year (of intercalation) is necessary. The overall basis for it is provided by cycles of 57 years. Eleven extra days are inserted in every 57 years, and seven extra months of 30 days are inserted in every 19 years (21 months in 57 years). This provides 20819 complete days to both calendars. This 57-year cycle would provide

2231-570: The Central Highlands of Vietnam) therefore helps explain the provenance of sediment reaching the delta and the Tonle Sap Great Lake today. Studies of the provenance of sediments in the Mekong delta reveal a major switch in the source of sediments about eight million years ago (Ma) . From 36 to 8 Ma the bulk (76%) of the sediments deposited in the delta came from erosion of the bedrock in the Three Rivers Area . From 8 Ma to

2328-545: The Human achievement index (HAI), a composite index covering all the eight key areas of human development. National Economic and Social Development Board (NESDB) has taken over this task since 2017. 16°32′46″N 104°43′34″E  /  16.54611°N 104.72611°E  / 16.54611; 104.72611 Mekong The Mekong or Mekong River is a trans-boundary river in East Asia and Southeast Asia . It

2425-521: The Lancang River ( simplified Chinese : 澜沧江 ; traditional Chinese : 瀾滄 江 ; pinyin : Láncāng Jiāng , from the old name of Lao kingdom Lan Xang ; the characters may also be literally understood as "turbulent green river"). It originates in the " three rivers source area " on the Tibetan Plateau in the Sanjiangyuan National Nature Reserve . The reserve protects the headwaters of, from north to south,

2522-591: The Nam Ngum , Nam Theun , Nam Hinboun, Se Bang Fai , Se Bang Hieng and Se Done Rivers. The Mun - Chi river system from the right bank in Thailand enters the mainstream within this reach. Reach 4: Pakse to Kratie . The main hydrological contributions to the mainstream in this reach come from the Se Kong , Se San , and Sre Pok catchments. Together, these rivers make up the largest hydrological sub-component of

2619-465: The Richter magnitude scale and is unlikely to cause material damage. The difficulty of navigating the river has meant that it has divided, rather than united, the people who live near it. The earliest known settlements date to 210 BCE, with Ban Chiang being an excellent example of early Iron Age culture. The earliest recorded civilization was the 1st century Indianised -Khmer culture of Funan , in

2716-464: The South China Sea . From the point where it rises to its mouth, the most precipitous drop in the Mekong occurs in the upper Mekong basin, a stretch of some 2,200 km (1,400 mi). Here, it drops 4,500 m (14,800 ft) before it enters the lower basin where the borders of Thailand, Laos, China, and Myanmar come together in the Golden Triangle. Downstream from the Golden Triangle,

2813-922: The Year of the Pig , Year 1132 of the Chulasakarat (Minor Era), [Year 2313 of the Buddhasakarat (Buddhist Era or BE)] of the Buddhist calendar . The realm of Mukdahan at this stage covered both sides of the Mekong and reached the frontier lands of the Vietnamese (including the Laotian province of Savannakhet). In B.E. 2321, during the Thonburi Period when King Taksin the Great extended his forces into

2910-1065: The Yellow (Huang He), the Yangtze , and the Mekong Rivers. It flows through the Tibetan Autonomous Region and then southeast into Yunnan Province, and then the Three Parallel Rivers Area in the Hengduan Mountains , along with the Yangtze to its east and the Salween River (Nu Jiang in Chinese) to its west. Then the Mekong meets the China–Myanmar border and flows about 10 km (6 mi) along that border until it reaches

3007-633: The Yunnan component makes up almost 30% of the average dry season flow. A major concern is that the ongoing and planned expansion of dams and reservoirs on the Mekong mainstream in Yunnan could have a significant effect on the low-flow regime of the lower Mekong basin system. Reach 2: Chiang Saen to Vientiane and Nong Khai . This reach is almost entirely mountainous and covered with natural forest although there has been widespread slash and burn agriculture. Although this reach cannot be termed "unspoiled",

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3104-662: The sidereal year as the solar year. One major difference is that the Southeast Asian systems, unlike their Indian cousins, do not use apparent reckoning to stay in sync with the sidereal year. Instead, they employ their versions of the Metonic cycle . However, since the Metonic cycle is not very accurate for sidereal years, the Southeast Asian calendar is slowly drifting out of sync with the sidereal, approximately one day every 100 years. Yet no coordinated structural reforms of

3201-615: The summer solstice while the Arakanese calendar inserts it after the vernal equinox . The Burmese calendar year consists of 354, 384 or 385 days. Note: The Arakanese calendar adds the intercalary day in Tagu, not in Nayon. The Cambodian, Lao and Thai lunisolar calendars use a slightly different method to place the intercalary day. Instead of it in a leap year as in the Burmese system,

3298-592: The tripoint of China, Myanmar and Laos . From there it flows southwest and forms the border of Myanmar and Laos for about 100 km (60 mi) until it arrives at the tripoint of Myanmar, Laos, and Thailand . This is also the point of confluence between the Ruak River (which follows the Thai–Myanmar border) and the Mekong. The area of this tripoint is sometimes termed the Golden Triangle , although

3395-418: The 12 signs of the zodiac, are used for astrological calculations. (The Burmese calendar also recognizes a solar month called Thuriya Matha , which is defined as 1/12th of a year. But the solar month varies by the type of year such as tropical year, sidereal year, etc.) The days of the month are counted in two halves, waxing and waning. The 15th of the waxing is the civil full moon day. The civil new moon day

3492-547: The 1950s to around 50% in the mid-1990s. Agricultural expansion and population pressure are the major reasons for land use and landscape change. Both drought and flood are common hazards in the Delta, which many people believe is the most sensitive to upstream hydrological change. Table 1: Country share of Mekong River Basin (MRB) and water flows By taking into account hydrological regimes, physiography land use, and existing, planned and potential resource developments,

3589-471: The 19th century under the names of Chula Sakarat and Jolak Sakaraj . The Burmese calendar in turn was based on the "original" Surya Siddhanta system of ancient India (believed to be Ardharatrika school). One key difference with Indian systems is that the Burmese system has followed a variation of the Metonic cycle . It is unclear from where, when or how the Metonic system was introduced; hypotheses range from China to Europe. The Burmese system, and indeed

3686-836: The Buddhist Era would now track the Thai solar calendar , the Siamese version of the Gregorian calendar with the New Year's Day of 1 April. Therefore, the Thai Buddhist Era year of 2455 began on 1 April 1912 (as opposed to 15 April 1912 according to the lunisolar calendar ). The Thai Buddhist Era was further realigned to the Gregorian calendar on 6 September 1940 when Prime Minister Phibunsongkhram decreed 1 January 1941 as

3783-780: The Great Lake via the Tonle Sap River . Phnom Penh also marks the beginning of the delta system of the Mekong River. Here the mainstream begins to break up into an increasing number of branches. In Cambodia, wet rice is the main crop and is grown on the flood plains of the Tonle Sap, Mekong, and Bassac (the Mekong delta distributary known as the Hậu in Vietnam) Rivers. More than half of Cambodia remains covered with mixed evergreen and deciduous broadleaf forest, but forest cover has decreased from 73% in 1973 to 63% in 1993. Here,

3880-734: The Kingdom of Thailand which is the mechanism for cooperation with regard to riverine trade on the upper stretches of the Mekong. The Mekong basin is one of the richest areas of biodiversity in the world. Only the Amazon boasts a higher level of bio-diversity. Biota estimates for the Greater Mekong Subregion (GMS) include 20,000 plant species, 430 mammals, 1,200 birds, 800 reptiles and amphibians, and an estimated 850 freshwater fish species (excluding euryhaline species mainly found in salt or brackish water, as well as introduced species ). The most species rich orders among

3977-630: The Mekong delta. Excavations at Oc Eo , near modern An Giang , have found coins from as far away as the Roman Empire . This was succeeded by the Khmer culture Chenla state around the 5th century. The Khmer empire of Angkor was the last great Indianized state in the region. From around the time of the fall of the Khmer empire, the Mekong was the front line between the emergent states of Siam and Tonkin (North Vietnam), with Laos and Cambodia, then on

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4074-780: The Mekong is called the Tiền River or Tiền Giang. In Vietnam, distributaries of the eastern (main, Mekong) branch include the Mỹ Tho River , the Ba Lai River , the Hàm Luông River , and the Cổ Chiên River . The Mekong Basin is frequently divided into two parts: the "upper Mekong basin" comprising those parts of the basin in Tibet , Yunnan and eastern Myanmar , and the "lower Mekong basin" from Yunnan downstream from China to

4171-467: The Mekong is divided into six distinct reaches : Reach 1: Lancang Jiang or Upper Mekong River in China . In this part of the river, the major source of water flowing into the river comes from melting snow on the Tibetan plateau . This volume of water is sometimes called the "Yunnan component" and plays an important role in the low-flow hydrology of the lower mainstream. Even as far downstream as Kratie,

4268-413: The Mekong to inspect the area and found that the area was indeed the remains of an ancient realm and in much better condition than any area along the left bank of the Mekong. He led his people from Baan Luang Phonsim to establish a settlement on the right bank at the mouth of Bang Muk. When he began to clear away the forests to make way for his resettlement of the realm, he found two Buddha images beneath

4365-462: The Mekong where the mouth of the stream Bang Muk (or 'Pearlhaven') was located, in which people had discovered pearls ( muk ; มุก) in clams there. Mukdahan can refer to most any semiprecious stone resembling the pearl having a grey dull color, and not necessarily the pearl oyster, Pinctada margaritifera . Lord Chanthakinnaree then renamed the realm Mueang Mukdahan, as from the Fourth Month of

4462-655: The Mekong, seasonal flows can be quite variable from year to year. Although the pattern of the annual hydrograph is fairly predictable, its magnitude is not. The average monthly flows along the mainstream are listed in Table 3, providing an indication of their range and variability from year to year. At Pakse , for example, flood season flows during August would exceed 20,000 m /s (5,300,000 US gal/s) nine years out of ten, but exceed 34,000 m /s (9,000,000 US gal/s) only one year in ten. Table 3: Mekong Mainstream monthly discharge, 1960–2004 (m /s). There

4559-634: The Sap River joins the Mekong by Phnom Penh, the Bassac River branches off the right (west) bank. The Bassac River is the first and main distributary of the Mekong. This is the beginning of the Mekong Delta. The two rivers, the Bassac to the west and the Mekong to the east, enter Vietnam shortly after this. In Vietnam, the Bassac is called the Hậu River (Sông Hậu or Hậu Giang); the main, eastern, branch of

4656-508: The Southeast Asian systems, thus use a "strange" combination of sidereal years from the Indian calendar in combination with the Metonic cycle better for tropical years . In all Theravada traditions,the calendar's epochal year 0 date was the day in which the Buddha attained parinibbāna . However, not all traditions agree on when it actually took place. In Burmese Buddhist tradition, it

4753-506: The Thai system places it in a separate year. Thus, the Thai small leap year has 355 days while the Thai great leap year has 384 days. Since the main purpose of Buddhist calendar is to keep pace with the solar year, the new year is always marked by the solar year , which falls at the time when the Sun enters Aries . The date, which at the present falls on the 17th of April, has slowly drifted over

4850-419: The area of the Mekong River, he ordered Phra Mahakasut Suek and Chao Phya Chakri to dispatch their troops to the banks of the Mekong in order to suppress and unify the lords of all the realms great and small there on both sides of the Mekong together under the reign of the Kingdom of Thonburi , declaring Lord Chanthakinnaree the Phya Chanthasrisuraja Uparaja Mandhaturaj (พระยาจันทรศรีสุราชอุปราชามันธาตุราช),

4947-430: The calendars share a common lineage, they also have minor but important variations such as intercalation schedules, month names and numbering, use of cycles, etc. In Thailand, the name Buddhist Era is a year numbering system shared by the traditional Thai lunar calendar and by the Thai solar calendar . The Southeast Asian lunisolar calendars are largely based on an older version of the Hindu calendar , which uses

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5044-440: The centuries. In the 20th century, the New Year's Day fell on April 15 or 16th but in the 17th century, it fell on April 9 or 10th. Thailand and Cambodia no longer use the traditional lunisolar calendar to mark the New Year's Day. The Cambodian, Lao and Thai systems give animal names to the years from a cycle of 12. The practice also existed in Burma in the Pagan period but later died out. The Cambodian calendar also maintains

5141-432: The city of Pakse . Thereafter, it turns and runs more or less directly south, crossing into Cambodia . At Phnom Penh the river is joined on the right bank by the river and lake system the Tonlé Sap . When the Mekong is low, the Tonle Sap is a tributary : water flows from the lake and river into the Mekong. When the Mekong floods, the flow reverses: the floodwaters of the Mekong flow up the Tonle Sap. Immediately after

5238-417: The coast, torn between their influence. The first European to encounter the Mekong was the Portuguese António de Faria in 1540. A European map of 1563 depicts the river, although even by then little was known of the river upstream of the delta. European interest was sporadic: the Spanish and Portuguese mounted some missionary and trade expeditions, while the Dutch Gerrit van Wuysthoff led an expedition up

5335-440: The delta advanced 200 km (120 mi) over the continental shelf of the South China Sea, covering an area of more than 62,500 km (24,100 sq mi). From 5.3 to 3.5 ka the delta advanced across a broad embayment formed between higher ground near the Cambodian border and uplands north of Ho Chi Minh City . During this phase of its development the delta was sheltered from the wave action of long-shore currents and

5432-452: The delta. For much of its length the Mekong flows through bedrock channels, i.e., channels that are confined or constrained by bedrock or old alluvium in the bed and riverbanks. Geomorphologic features normally associated with the alluvial stretches of mature rivers, such as meanders , oxbow lakes , cut-offs, and extensive floodplains are restricted to a short stretch of the mainstream around Vientiane and downstream of Kratie where

5529-434: The difference between BE and CE can be 543 or 544 for CE dates, and 544 or 543 for BCE dates, depending on the month of the Buddhist Era (as the Buddhist calendar straddles the Gregorian calendar—currently from April to April). The calendar recognizes two types of months: synodic month and sidereal month . The Synodic months are used to compose the years while the 27 lunar sidereal days (Sanskrit: nakshatra ), alongside

5626-460: The first Lord of the Realm of Mukdahan and thereby officially naming the realm "Mueang Mukdahan". The city of Mukdahan was founded in 1770 by Lord Chanthakinnaree of Phonsim. It was originally administered within Monthon Udon Thani , but in 1907 it became a district (amphoe) of Nakhon Phanom province . On 27 September 1982 Mukdahan was upgraded to provincial status. In 2006, the Second Thai–Lao Friendship Bridge , from Mukdahan to Savannakhet, Laos

5723-420: The freshwater fish in the river basin are cypriniforms (377 species) and catfish (92 species). Buddhist calendar The Buddhist calendar is a set of lunisolar calendars primarily used in Tibet , Cambodia , Laos , Myanmar , Bangladesh , India , Sri Lanka , Thailand and Vietnam as well as in Malaysia and Singapore and by Chinese populations for religious or official occasions. While

5820-434: The ghost lost its way'. It then turns east into the interior of Laos, flowing first east and then south for some 400 km (250 mi) before meeting the border with Thailand again. Once more, it defines the Laos-Thailand border for some 850 km (530 mi) as it flows first east, passing the capital of Laos, Vientiane , then turns south. A second time, the river leaves the border and flows east into Laos soon passing

5917-528: The high rainfall areas of Laos. The second group are those on the right bank, mainly the Mun and Chi Rivers, that drain a large part of northeast Thailand. Laos lies almost entirely within the lower Mekong basin. Its climate, landscape and land use are the major factors shaping the hydrology of the river. The mountainous landscape means that only 16% of the country is farmed under lowland terrace or upland shifting cultivation . With upland shifting agriculture (slash and burn), soils recover within 10 to 20 years but

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6014-529: The hydrological impacts of land cover changes induced by the Vietnam War were quantified in two sub-catchments of the lower Mekong River basin. Loss of forest cover in the Thai areas of the lower basin has been the highest of all the lower Mekong countries over the past 60 years. On the Khorat Plateau , which includes the Mun and Chi tributary systems, forest cover was reduced from 42% in 1961 to 13% in 1993. Although this part of northeast Thailand has an annual rainfall of more than 1,000 mm (40 in),

6111-437: The hydrological response is perhaps the most natural and undisturbed of all the lower basin. Many hydrological aspects of the lower basin start to change rapidly at the downstream boundary of this reach. On 19 July 2019 this reach of the river dropped to its lowest level in a century. Officials are particularly concerned as July is in the wet season, when mainstream flows are abundant historically. Locals are blaming low water on

6208-437: The lower basin from Yunnan make up about 15% of the wet season flow at Kratie . This rises to 40% during the dry season, even this far downstream. During the wet season, the proportion of average flow coming from Yunnan rapidly decreases downstream of Chiang Saen, from 70% to less than 20% at Kratie. The dry season contribution from Yunnan is much more significant. The major portion of the balance comes from Laos, which points to

6305-411: The lower basin. Over 25% of the mean annual flow volume to the mainstream at Kratie comes from these three river basins. They are the key element in the hydrology of this part of the system, especially to the Tonle Sap flow reversal. Reach 5: Kratie to Phnom Penh . This reach includes the hydraulic complexities of the Cambodian floodplain, the Tonle Sap and the Great Lake. By this stage, over 95% of

6402-449: The lunisolar calendar have been undertaken. Today, the traditional Buddhist lunisolar calendar is used mainly for Theravada Buddhist festivals. The Thai Buddhist Era, a renumbered Gregorian calendar , is the official calendar in Thailand. The calculation methodology of the current versions of Southeast Asian Buddhist calendars is largely based on that of the Burmese calendar , which was in use in various Southeast Asian kingdoms down to

6499-463: The months by numbers, not by names. This means reading ancient texts and inscriptions in Thailand requires constant vigilance, not just in making sure one is correctly operating for the correct region, but also for variations within regions itself when incursions cause a variation in practice. The Buddhist calendar is a lunisolar calendar in which the months are based on lunar months and years are based on solar years . One of its primary objectives

6596-425: The name of Thai solar calendar . In Myanmar, Burmese calendarists have tried to deal with the issue by periodically modifying the intercalation schedule in the Metonic cycle. One major downside of this approach is that it is not possible to publish future calendars more than a few years (often even a year) ahead. The Buddhist Era was first introduced to Southeast Asia along with Buddhism in the early centuries CE. It

6693-439: The newly constructed Xayaburi Dam , as it enters its test phase prior to the start of commercial operation in October 2019. Reach 3: Vientiane and Nong Khai to Pakse . The boundary between Reach 2 and 3 is where the Mekong hydrology starts to change. Reach 2 is dominated in both wet and dry seasons by the Yunnan Component. Reach 3 is increasingly influenced by contributions from the large left bank tributaries in Laos, namely

6790-406: The presence of rapids and waterfalls in the Mekong make navigation difficult. Even so, the river is a major trade route between Tibet and Southeast Asia. The construction of hydroelectric dams along the Mekong in the 2000s through the 2020s has caused serious problems for the river's ecosystem , including the exacerbation of drought . The Mekong was originally called Mae Nam Khong from

6887-534: The present, however, the contribution from the Three Rivers Area fell to 40%, while that from the Central Highlands rose from 11 to 51%. One of the most striking conclusions of provenance studies is the small contribution of sediment from the other parts of the Mekong basin, notably the Khorat Plateau, the uplands of northern Laos and northern Thailand, and the mountain ranges south of the Three Rivers area. The last glacial period came to an abrupt end about 19,000 years ago (19 ka ) when sea levels rose rapidly, reaching

6984-436: The principal crops. Drought is by far the major hydrological hazard in this region. As the Mekong enters Cambodia, over 95% of its flows have already joined the river. From here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape. The seasonal cycle of changing water levels at Phnom Penh results in the unique "flow reversal" of water into and out of

7081-796: The principal left bank tributaries enter the mainstream, mainly the Nam Ngum and Nam Theun. The flow level falls again, even with the right bank entry of the Mun-Chi system from Thailand. Although the Mun–Chi basin drains 20% of the lower system, average annual runoff is only 250 mm (10 in). Runoff in the mainstream increases again with the entry from the left bank of the Se Kong from southern Laos and Se San and Sre Pok from Vietnam and Cambodia. Table 2: Lower Mekong Mainstream annual flow (1960 to 2004) at selected sites. Flows at Chiang Saen entering

7178-462: The proper name of the Yangtze before becoming a generic word for major rivers. To the early European traders, the Mekong River was also known as Mekon River , May-Kiang River and Cambodia River . The local names for the river include: The Mekong rises as the Za Qu ( Tibetan : རྫ་ཆུ་ , Wylie : rDza chu , ZYPY : Za qu ; Chinese : 扎曲 ; pinyin : Zā Qū ) and soon becomes known as

7275-495: The river as far as Vientiane in 1641–42. The French invaded the region in the mid-19th century, capturing Saigon in 1861, and establishing a protectorate over Cambodia in 1863. The first systematic European exploration began with the French Mekong Expedition led by Ernest Doudard de Lagrée and Francis Garnier , which ascended the river from its mouth to Yunnan between 1866 and 1868. Their chief finding

7372-448: The river develops alluvial channels that are free of control exerted by the underlying bedrock. The Mekong basin is not normally considered a seismically active area as much of the basin is underlain by the relatively stable continental block. Nonetheless, the parts of the basin in northern Laos , northern Thailand , Myanmar and China do experience frequent earthquakes and tremors. The magnitude of these earthquakes rarely exceeds 6.5 on

7469-480: The river flows for a further 2,600 km (1,600 mi) through Laos, Thailand, and Cambodia before entering the South China Sea via a complex delta system in Vietnam . The upper basin makes up 24% of the total area and contributes 15–20% of the water that flows into the Mekong River. The catchment here is steep and narrow with Soil erosion being a major problem and as a result of this, approximately 50% of

7566-464: The river landscape is flat. Small changes in water level determine the direction of water movement, including the large-scale reversal of flow into and out of the Tonle Sap basin from the Mekong River. The Mekong Delta in Vietnam is farmed intensively and has little natural vegetation left. Forest cover is less than 10%. In the Central Highlands of Vietnam, forest cover was reduced from over 95% in

7663-405: The seasons. The calendars are drifting one day approximately every 60 years and 4 months. The accumulating drift against the seasons means the New Year's Day which used to fall on 22 March (near the vernal equinox ) in 638 CE now falls on 17 April in 2013 CE. There is no known internationally concerted effort to stop this drift. Thailand has moved its "Buddhist Era" to the Gregorian calendar under

7760-477: The sediment in the river comes from the upper basin. In Yunnan Province in China, the river and its tributaries are confined by narrow, deep gorges. The tributary river systems in this part of the basin are small. Only 14 have catchment areas that exceed 1,000 km (400 sq mi), yet the greatest amount of loss of forest cover in the entire river system per square kilometer has occurred in this region due to heavy unchecked demand for natural resources. In

7857-463: The solar year, by inserting intercalary months and days on the Metonic cycle (in the case of the Burmese calendar, on a modified Metonic cycle). However, the solar year as defined by the Buddhist calendars is really a sidereal year , which is nearly 24 minutes longer than the actual mean tropical year . Therefore, like all sidereal-based calendars, the lunisolar calendars are slowly drifting away from

7954-507: The south of Yunnan, in Simao and Xishuangbanna Prefectures, the river changes as the valley opens out, the floodplain becomes wider, and the river becomes wider and slower. Major tributary systems develop in the lower basin. These systems can be separated into two groups: tributaries that contribute to the major wet season flows, and tributaries that drain low relief regions of lower rainfall. The first group are left bank tributaries that drain

8051-633: The support of the Office of Weapons Removal and Abatement within the US State Department Bureau of Political-Military Affairs , to conduct underwater explosive removal. The many maps of the river basin produced throughout recorded history reflect the region's changing human geography and politics. In 1995, Laos, Thailand, Cambodia, and Vietnam established the Mekong River Commission (MRC) to manage and coordinate

8148-415: The term also refers to the much larger area of those three countries that was notorious as a drug producing region. From the Golden Triangle tripoint, the Mekong turns southeast to briefly form the border of Laos with Thailand. Khon Pi Long is a series of rapids along a 1.6 km (1.0 mi) section of the Mekong River dividing Chiang Rai and Bokeo Province in Laos. The name of the rapids means 'where

8245-572: The total flow has entered the Mekong system. The focus turns from hydrology and water discharge to the assessment of water level, over- bank storage and flooding and the hydrodynamics that determine the timing, duration and volume of the seasonal flow reversal into and out of the Great Lake. Reach 6: Phnom Penh to the South China Sea . Here the mainstream divides into a complex and increasingly controlled and artificial system of branches and canals. Key features of flow behaviour are tidal influences and salt water intrusion. Every year, 35–50% of this reach

8342-478: The underlying geological structure is fairly homogeneous and stable, exerting little or no control on river morphology . In marked contrast, the tributary networks of the Salween , Yangtze , and particularly the Mekong, are complex with different sub-basins often exhibiting different, and distinct, drainage patterns. These complex drainage systems have developed in a setting where the underlying geological structure

8439-687: The use and care of the Mekong. In 1996 China and Myanmar became "dialogue partners" of the MRC and the six countries now work together in a cooperative framework. In 2000, the governments of China, Laos, Thailand and Myanmar signed a Agreement on Commercial Navigation on Lancang-Mekong River among the Governments of the People's Republic of China, the Lao People's Democratic Republic, the Union of Myanmar and

8536-419: The vegetation does not. Shifting cultivation is common in the uplands of northern Laos and is reported to account for as much as 27% of the total land under rice cultivation. As elsewhere in the basin, forest cover has been steadily reduced during the last three decades by shifting agriculture and permanent agriculture. The cumulative impacts of these activities on the river regime have not been measured. However,

8633-478: The vihara at the Sri Mongkol Temple, the inhabitants of the realm named it Phra Chao Ong Luang (พระเจ้าองค์หลวง), or 'Venerable Holy One', and made it the representative image of Wat Sri Mongkol, which itself was later renamed Wat Sri Mongkol South. This Buddha image has been associated with the settlement and realm ever since. During the rebuilding of the realm, at around midnight there were reports of

8730-521: The wars in Indochina in the 1970s, a significant quantity of explosives (sometimes, entire barges loaded with military ordnance ) sank in the Cambodian section of the Mekong (as well as in the country's other waterways). Besides being a danger for fishermen, unexploded ordnance also creates problems for bridge and irrigation systems construction. As of 2013, Cambodian volunteers are being trained, with

8827-501: Was 13 May 554 BCE (Tuesday, Full moon of Kason 148 Anjanasakaraj). But in Thailand, it was 11 March 545 BCE, the date which the current Thai lunisolar and solar calendars use as the epochal date. Yet, the Thai calendars for some reason have fixed the difference between their Buddhist Era (BE) numbering and the Christian/Common Era (CE) numbering at 543, which points to an epochal year of 544 BCE, not 545 BCE. In Myanmar,

8924-481: Was constructed largely through fluvial and tidal processes. At this time the delta was advancing at a rate of 17 to 18 m (56 to 59 ft) per year. After 3.5 ka, however, the delta had built out beyond the embayment and became subject to wave action and marine currents. These deflected deposition south-eastwards in the direction of the Cà Mau Peninsula , which is one of the most recent features of

9021-664: Was gradually replaced by the Burmese Era or Culāsakaraj, first in Myanmar in 640 CE, and in other Theravada kingdoms of Southeast Asia between the 13th and 16th centuries. Theravada Buddhist tradition also recognizes pre-Buddhist Anjana Sakaraj (Añjana's Era) since the events of the Buddha's life are recorded in that era. The tradition of using different reference calendars continued in Siam in 1912 when King Vajiravudh decreed that

9118-594: Was not a separate calendar but simply a year numbering system that employed the organization and calculation methods of the prevailing lunisolar calendars in use throughout the region. In the early centuries CE, the reference civil calendar of the Buddhist calendar prevalent in Southeast Asia was the Saka Era (Mahāsakaraj Era) , which is said to have been adopted by the Pyu state of Sri Ksetra in 80 CE. The Saka Era

9215-627: Was opened. In 2018, the Airports Department of the Thai Ministry of Transport announced that it would spend six million baht on a Mukdahan International Airport feasibility study. If built, it would become Thailand's thirtieth international airport. The study is to be completed by March 2019. The provincial seal shows the Prasart Song Nang Sathit Palace, in which a moonstone is displayed on

9312-542: Was that the Mekong had too many falls and rapids to ever be useful for navigation . The river's source was found by Pyotr Kuzmich Kozlov in 1900. From 1893, the French extended their control of the river into Laos, establishing French Indochina by the first decade of the 20th century. This lasted until the First and Second Indochina Wars expelled French from its former colony and defeated US-supported governments. During

9409-428: Was then named Phra Loup Lek (พระหลุบเหล็ก), or 'Venerable One of Ironmetal Who Shrouds Himself'. Today the site where Phra Loup Lek would submerge himself beneath the earth has been overtaken by the waters of the Mekong and washed away (presumably leaving only the shrine rescued and preserved at the front of the vihara at today's Wat Sri Mongkol South (วัดศรีมงคลใต้)). As for the brick-and-mortar Buddha image enshrined in

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