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54-582: Jerimalai has the third oldest findings discovered in Wallacea , after Madjedbebe in mainland Northern Australia and the Laili cave near Manatuto on Timor. The cave lies at an altitude of 75 m, less than a kilometer from the sea. 42,000 years ago, the sea was 55 m lower than in 2016, and the cave was 2.8 km from the sea. 22,000 years ago, during the Last Glacial Maximum , the sea level

108-565: A wetland of international importance under the Ramsar Convention . Sumatra has lost almost 50% of its tropical rainforest since 1980. Many species are now critically endangered , such as the Sumatran ground cuckoo , the Sumatran tiger , the Sumatran elephant , the Sumatran rhinoceros , and the Sumatran orangutan . Deforestation on the island has also resulted in serious seasonal smoke haze over neighbouring countries, such as

162-491: A 9.2 earthquake shook Bengkulu and Western Sumatra. Both events caused large tsunamis . Earthquakes are very common throughout the coastal area of the west and center of the island, and tsunamis are common due to the high seismicity in the area. By population, Medan is the largest city in Sumatra. Medan is also the most visited and developed city in Sumatra. Sumatra supports a wide range of vegetation types that are home to

216-523: A mix of ancestral and derived traits suggest murid rodents made it to Australia earlier, maybe in the Miocene, over a forested archipelago, i.e. Wallacea, and evolved in Australia in isolation. Australia's rodents make up much of the continent's placental mammal fauna and include various species from stick-nest rats to hopping mice . Other mammals invaded from the east. Two species of cuscus ,

270-709: A predominant genus of trees in Australia, are found in Wallacea: Eucalyptus deglupta on Sulawesi, and E. urophylla and E. alba in East Nusa Tenggara. For land snails Wallacea and Wallace's Line do not form a barrier for dispersal. Sumatra Sumatra ( / s ʊ ˈ m ɑː t r ə / ) is one of the Sunda Islands of western Indonesia . It is the largest island that is fully within Indonesian territory, as well as

324-528: A rich variety of species, including 17 endemic genera of plants. Unique species include the Sumatran pine which dominates the Sumatran tropical pine forests of the higher mountainsides in the north of the island and rainforest plants such as Rafflesia arnoldii (the world's largest individual flower), and the titan arum (the world's largest unbranched inflorescence ). The island is home to 201 mammal species and 580 bird species. There are nine endemic mammal species on mainland Sumatra and 14 more endemic to

378-675: A stiff economic decline as the heritage of the Srivijaya empire was superseded by the economic policy of the Singhasari and Majapahit . The Palembang sultanate experienced a terminal decline in the early 19th century. With the coming of the Dutch Empire , the many Sumatran princely states gradually fell under their control. Aceh posed major obstacles, as the Dutch were involved in the long and costly Aceh War (1873–1903). During

432-495: Is also an area in the archipelago that received the spread of Islam first compared to other islands or other areas. The island of Sumatra became the first area to receive the spread of Islam because of the position of the island of Sumatra which is close to the Malacca strait. The initial process of Islamization related to trade and also the formation of the kingdom. Islam entered Sumatra through pious Arabs and Tamil traders in

486-521: Is also used as an inter-ethnic means of communication in some parts of Aceh province. Religion in Sumatra (2023) The majority of people in Sumatra are Muslims (87.12%), while 10.69% are Christians, and less than 2.19% are Buddhists and Hindus. Sumatra is one of seven geographical regions of Indonesia , which includes its adjacent smaller islands. Sumatra was one of the eight original provinces of Indonesia between 1945 and 1948. Including adjacent archipelagoes normally included with Sumatra (such as

540-736: Is below the detection limit . The inhabitants of the cave fed on turtles, tuna and giant rats (probably Coryphomys buehleri ). Archaeologists also believe some stones and shells were used as jewelry. Tools found in Jerimalai are similar to findings in the Liang Bua cave attributed to Homo floresiensis , who lived on the nearby island of Flores until 50,000 years ago. The high similarity has prompted questions about whether tools in Liang Bua were made by Homo sapiens , and not by Homo floresiensis . The fish remains found in Jerimalai are

594-755: Is higher among terrestrial vertebrate species; out of 1,142 species described there, almost half (529) were endemic. 45% of the region retains some sort of forest cover, though only 52,017 km (15%) is in a pristine state. Of Wallacea's total 347,000 km -area, about 20,000 km are protected. Tropical and subtropical moist broadleaf forests : Tropical and subtropical dry broadleaf forests : Australia may be isolated by sea, but technically through Wallacea, it can be zoologically extended. Australian Early-Middle Pliocene rodent fossils have been found in Chinchilla Sands and Bluffs Down in Queensland, but

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648-540: Is particularly noted for its butterflies and birds, including the Moluccan king parrot . Smaller mammals, including some carnivorans (such as civets ), marsupials (such as the cuscus ), primates and rodents are common throughout the region. A large portion of the waters surrounding Wallacea are part of the Coral Triangle , considered to be the richest coral reef and marine ecosystems on earth, with

702-583: Is the largest producer of Indonesian coffee . Small-holders grow Arabica coffee ( Coffea arabica ) in the highlands, while Robusta ( Coffea canephora ) is found in the lowlands. Arabica coffee from the regions of Gayo, Lintong and Sidikilang is typically processed using the Giling Basah (wet hulling) technique, which gives it a heavy body and low acidity. Sumatra is a highly seismic island. Huge earthquakes have been recorded throughout history. In 1797, an 8.9 earthquake shook Western Sumatra, and in 1833,

756-531: Is the midpoint, at which Asian and Australian fauna and flora are approximately equally represented. It follows the deepest straits traversing the Indonesian Archipelago . The Wallace Line is named after the Welsh naturalist Alfred Russel Wallace , who recorded the differences between mammal and bird fauna between the islands on either side of the line. The islands of Sundaland to the west of

810-529: The 2005 Nias–Simeulue earthquake and the 2010 Mentawai earthquake and tsunami . Lake Toba is the site of a supervolcanic eruption that occurred around 74,000 years ago, representing a climate-changing event. The most important rivers in Sumatra belong to the catchment area of the South China Sea . Heading north to south, the Asahan , Rokan , Siak , Kampar , Indragiri , Batanghari flow into

864-506: The 2013 Southeast Asian haze which caused considerable tensions between Indonesia and affected countries Malaysia and Singapore . The widespread deforestation and other environmental destruction in Sumatra and other parts of Indonesia has often been described by academics as an ecocide . Sumatra was known in ancient times by the Sanskrit names of Svarṇadvīpa ('Island of Gold') and Svarṇabhūmi ('Land of Gold'), because of

918-404: The 2013 Southeast Asian haze which caused considerable tensions between Indonesia and affected countries Malaysia and Singapore . The widespread deforestation and other environmental destruction in Sumatra and other parts of Indonesia has often been described by academics as an ecocide . Several unconnected railway networks built during Netherlands East Indies exist in Sumatra, such as

972-659: The Asian and Australian continental shelves . Wallacea includes Sulawesi , the largest island in the group, as well as Lombok , Sumbawa , Flores , Sumba , Timor , Halmahera , Buru , Seram , and many smaller islands. The islands of Wallacea lie between the Sunda Shelf (the Malay Peninsula , Sumatra , Borneo , Java , and Bali ) to the west, and the Sahul Shelf including Australia and New Guinea to

1026-807: The Barisan Mountains in the west and swampy plains in the east. Sumatra is the closest Indonesian island to mainland Asia. To the southeast is Java , separated by the Sunda Strait . To the north is the Malay Peninsula (located on the Asian mainland), separated by the Strait of Malacca . To the east is Borneo , across the Karimata Strait . West of the island is the Indian Ocean . The Great Sumatran fault (a strike-slip fault), and

1080-542: The Java Sea . The Bukit Barisan mountains, which contain several active volcanoes, form the backbone of the island, while the northeastern area contains large plains and lowlands with swamps, mangrove forest and complex river systems. The equator crosses the island at its centre in West Sumatra and Riau provinces. The climate of the island is tropical , hot, and humid. Lush tropical rain forest once dominated

1134-532: The Malacca Strait , while the island's largest river, the Musi , flows into the sea at Bangka Strait in the south. To the east, big rivers carry silt from the mountains, forming the vast lowland interspersed by swamps. Even if mostly unsuitable for farming, the area is currently of great economic importance for Indonesia. It produces oil from both above and below the soil – palm oil and petroleum . Sumatra

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1188-584: The Second World War , Japan invaded Sumatra in 1942. The Free Aceh Movement fought against Indonesian government forces in the Aceh Insurgency from 1976 to 2005. Security crackdowns in 2001 and 2002 resulted in several thousand civilian deaths. The island was heavily impacted by both the 1883 Krakatoa eruption and the 2004 Boxing Day Tsunami . Sumatra’s population as of 2023 was estimated to be about 60,795,669 ; it has about

1242-691: The Sulawesi bear cuscus and the Sulawesi dwarf cuscus , are the westernmost representatives of the Australasian marsupials. The tectonic uplift of Wallacea during the collision between Australia and Asia c. 23 million years ago allowed the global dispersal of passerine birds from Australia across the Indonesian islands. Bustards and megapodes must have somehow colonized Australia. Cockatiels similar to those from Australia inhabit Komodo Island in Wallacea. A few species of Eucalyptus ,

1296-577: The Sunda megathrust (a subduction zone ), run the entire length of the island along its west coast. On 26 December 2004, the western coast and islands of Sumatra, particularly Aceh province, were struck by a tsunami following the Indian Ocean earthquake . This was the longest earthquake recorded, lasting between 500 and 600 seconds (8.33–10 minutes). More than 170,000 Indonesians were killed, primarily in Aceh. Other recent earthquakes to strike Sumatra include

1350-526: The floristic province of Malesia . Similarly, Australia and New Guinea to the east are linked by a shallow continental shelf, and were linked by a land bridge during the ice ages, forming a single continent that scientists variously call Australia-New Guinea , Meganesia, Papualand, or Sahul. Consequently, Australia, New Guinea, and the Aru Islands share many marsupial mammals, land birds, and freshwater fish that are not found in Wallacea. Although

1404-519: The sixth-largest island in the world at 482,286.55 km (182,812 mi. ), including adjacent islands such as the Simeulue , Nias , Mentawai , Enggano , Riau Islands , Bangka Belitung and Krakatoa archipelago . Sumatra is an elongated landmass spanning a diagonal northwest–southeast axis. The Indian Ocean borders the northwest, west, and southwest coasts of Sumatra, with the island chain of Simeulue , Nias , Mentawai , and Enggano off

1458-479: The 13th century. In terms of economic development the port of Banda Aceh only started to face competition in the 18th century when more ports were constructed in Sumatra for maritime transport . Nevertheless, major pepper suppliers used the port of Banda Aceh at the beginning of the 19th century. The port in Medan grew swiftly in the late 19th and early 20th century. Meanwhile the medium sized port of Palembang faced

1512-1250: The 2010 census (including Riau Islands , Bangka Belitung , Nias , Mentawai , Simeulue and islands around it) There are over 52 languages spoken, all of which (except Chinese and Tamil) belong to the Malayo-Polynesian branch of the Austronesian language family. Within Malayo-Polynesian, they are divided into several sub-branches: Chamic (which are represented by Acehnese in which its closest relatives are languages spoken by Ethnic Chams in Cambodia and Vietnam), Malayic ( Malay , Minangkabau and other closely related languages), Northwest Sumatra–Barrier Islands ( Batak languages , Gayo and others), Lampungic (includes Proper Lampung and Komering ) and Bornean (represented by Rejang in which its closest linguistic relatives are Bukar Sadong and Land Dayak spoken in West Kalimantan and Sarawak ( Malaysia )). Northwest Sumatra–Barrier Islands and Lampungic branches are endemic to

1566-477: The 6th and 7th centuries AD. At the beginning and end of the 13th century the formation of the kingdom, the king of the Samudra kingdom had converted to Islam. Marco Polo visited the island in 1292, and his fellow Italian Odoric of Pordenone in 1321. Aceh in the north of Sumatra became known in the 16th century as trading centre for the pepper trade by shipping quality piperaceae ( pepper ). Aceh became

1620-565: The Indonesian government announced a plan to protect Sumatra's remaining forests. The island includes more than 10 national parks, including three which are listed as the Tropical Rainforest Heritage of Sumatra World Heritage Site – Gunung Leuser National Park , Kerinci Seblat National Park and Bukit Barisan Selatan National Park . The Berbak National Park is one of three national parks in Indonesia listed as

1674-686: The Portuguese throughout the 16th and 17th century. When the Dutch were weakened in the 18th century the British empire began to actively intervene in Aceh, establishing close relations between Banda Aceh and Penang . In the 17th and 18th century the Aceh Sultanate battled the Siak sultanate in the south of Sumatra. The port city of Banda Aceh was recorded in European historical writings since

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1728-563: The Riau Islands, Nias and the Bangka-Belitung group), it now covers ten of Indonesia's 38 provinces , which are set out below with their areas and populations. The longest axis of the island runs approximately 1,790 km (1,110 mi) northwest–southeast, crossing the equator near the centre. At its widest point, the island spans 435 km (270 mi). The interior of the island is dominated by two geographical regions:

1782-668: The babirusa, or "deer-pig" ( Babyrousa sp.), both found on Sulawesi, among other islands. Maluku shares a number of similar species with Sulawesi, albeit with fewer total, given the differences in size between the two islands—Sulawesi has at least 4,000 recorded terrestrial plant and animal species, while Maluku has just over 1,000, by comparison. Sulawesi is home to over 2,000 invertebrate species (with over 1,000 known species of arthropod , not including nearly 900 lepidopterans ), 100 species of reptiles and amphibians , and 288 bird species. Maluku has around 70 reptile and amphibian, 250 avian, and over 550 invertebrate species. Seram Island

1836-510: The distant ancestors of Wallacea's flora and fauna may have been from Asia or Australia-New Guinea, Wallacea is home to many endemic species. There is extensive autochthonous speciation and proportionately large numbers of endemics; the area is an important contributor to the overall mega- biodiversity of the Indonesian Archipelago. Fauna includes the lowland and mountain anoa , or dwarf buffalo ( Bubalus sp.), and

1890-605: The entire island. By the year 692 , the Melayu Kingdom was absorbed by Srivijaya . Srivijaya's influence waned in the 11th century, specifically in the year 1025, after suffering defeat at the hands of the Chola Empire in southern India By the end of the 12th century, Srivijaya had been reduced to a kingdom, and its dominant role in South Sumatra ended with the last king, Ratu Sekekhummong, who founded

1944-412: The gold deposits in the island's highlands . The earliest known mention of the current form "Sumatra" was in 1017, when the local king Haji Sumatrabhumi ("king of the land of Sumatra") sent an envoy to China . Arab geographers referred to the island as Lamri ( Lamuri , Lambri or Ramni ) in the tenth through thirteenth centuries, in reference to a kingdom near modern-day Banda Aceh which

1998-493: The highest number of species, adding to the total biodiversity of the region. Wallacea was originally almost completely forested, mostly tropical moist broadleaf forests , with some areas of tropical dry broadleaf forest . The higher mountains are home to montane and subalpine forests, and mangroves are common in coastal areas. According to Conservation International , Wallacea is home to over 10,000 plant species, of which approximately 1,500 (15%) are endemic. Endemism

2052-678: The island. Like all parts of Indonesia, Indonesian (which was based on Riau Malay) is the official language and the main lingua franca. Although Sumatra has its own local lingua franca, variants of Malay like Medan Malay and Palembang Malay are popular in North and South Sumatra, especially in urban areas. Minangkabau (Padang dialect) is popular in West Sumatra, some parts of North Sumatra, Bengkulu, Jambi and Riau (especially in Pekanbaru and areas bordered with West Sumatra ) while Acehnese

2106-529: The islands of Sundaland to one another and to Asia and allowing Asian land animals to inhabit these islands. The islands of Wallacea have few land mammals, land birds, or freshwater fish of continental origin, which find it difficult to cross open ocean . Many species of birds, reptiles, and insects were better able to cross the straits, and many such species of Australian and Asian origin are found there. Wallacea's plants are predominantly of Asian origin, and botanists include Sundaland, Wallacea, and New Guinea as

2160-463: The islands of the southern route were too young to prove that the southern route was the propagation path. Jerimalai also preserves fossils of birds . With the exception of an undescribed species of Grus , all the avian remains represent taxa still extant in the present. Wallacea Wallacea / w ɒ ˈ l eɪ s i ə / is a biogeographical designation for a group of mainly Indonesian islands separated by deep-water straits from

2214-399: The kingdom as Samara , while his contemporary fellow Italian traveller Odoric of Pordenone used the form Sumoltra . Later in the 14th century the local form "Sumatra" became popular abroad due to the rising power of the kingdom of Samudera Pasai and the subsequent Sultanate of Aceh . From then on, subsequent European writers mostly used Sumatra or similar forms of the name for

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2268-447: The landscape. Sumatra has a wide range of plant and animal species but has lost almost 50% of its tropical rainforest in the last 35 years. Many species are now critically endangered , such as the Sumatran ground cuckoo , the Sumatran tiger , the Sumatran elephant , the Sumatran rhinoceros , and the Sumatran orangutan . Deforestation on the island has also resulted in serious seasonal smoke haze over neighbouring countries, such as

2322-516: The line, including Sumatra, Java, Bali, and Borneo, share a mammal fauna similar to that of East Asia, which includes tigers, rhinoceros, and apes; whereas the mammal fauna of Lombok and areas extending eastwards are mostly populated by marsupials and birds similar to those in Australasia. Sulawesi shows signs of both. During the ice ages, sea levels were lower, exposing the Sunda shelf that links

2376-643: The main commercial centre of the Aceh Sultanate and trading routes were established to the Mediterranean via the Red Sea to rival the Portuguese shipping lanes . The reign of Iskandar Muda is known as the golden age of Sumatra because he extended the cultural influence of the Aceh Sultanate to Padang and Johor . The Aceh Sultanate sustained the rivalry with the Johor sultanate , the Dutch, and

2430-457: The milestone of Kepaksian Sekala Brak in the 13th century AD with the Dalom building. At the same time, the spread of Islam in Indonesia occurred gradually and indirectly, starting from the western regions such as the Sumatra area which became the first place for the spread of Islam in the archipelago, then Java, then to the eastern regions of Indonesia, Sulawesi and Maluku. The island of Sumatra

2484-416: The nearby Mentawai Islands . There are about 300 freshwater fish species in Sumatra. There are 93 amphibian species in Sumatra, 21 of which are endemic to Sumatra. The Sumatran tiger , Sumatran rhinoceros , Sumatran elephant , Sumatran ground cuckoo , Sumatran orangutan and Tapanuli orangutan are all critically endangered, indicating the highest level of threat to their survival. In October 2008,

2538-481: The oldest evidence of fishing far from the shore. In addition, a fish hook believed to be between 16,000 and 23,000 years old was discovered. The four inches long hook is made from the shell of a marine snail. The hook was used to catch fish in the coastal waters, which at the time were rich in coral reef fish. The high advancement of fishing technique for the time can be explained by the lack of land animals on Timor in that era. 40,000 years ago, rodents and reptiles were

2592-445: The only land species available to the inhabitants of Timor. Five pieces of jewelry were also found, made from the shell o f Nautilus pompilius and stained with ocher . They had small tiles and drilled holes. Since nautiluses are usually caught at depths of 150 m or more, it is believed that the shells were collected washed up on the beach. This would also explain why among the thousands of shell fragments (about 50 kg of material

2646-473: The same number of inhabitants as South Africa , making it the fifth-most populous island in the world . Yet because it is such a large island, it is not densely populated: it has an average of about 126 people per km . The largest indigenous ethnic groups in Sumatra are Malays, Minangkabaus, Bataks, Acehnese, and Lampungs. Other major non-indigenous ethnic groups are Javanese , Sundanese , and Chinese . Below are 11 largest ethnic groups in Sumatra based on

2700-603: The south and east. The total land area of Wallacea is 347,000 km (134,000 sq mi). Wallacea is defined as the series of islands stretching between the two continental shelves of Sunda and Sahul , but excluding the Philippines . Its eastern border (separating Wallacea from Sahul) is represented by a zoogeographical boundary known as Lydekker's Line , while the Wallace Line (separating Wallacea from Sunda) defines its western border. The Weber Line

2754-626: The western coast. In the northeast, the narrow Strait of Malacca separates the island from the Malay Peninsula , which is an extension of the Eurasian continent. In the southeast, the narrow Sunda Strait , containing the Krakatoa Archipelago , separates Sumatra from Java . The northern tip of Sumatra is near the Andaman Islands , while off the southeastern coast lie the islands of Bangka and Belitung, Karimata Strait and

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2808-459: Was 121 m lower than in 2016 and Jerimalai was 3.5 km from the shore. During the glacial age, the descent from the cave to the coastline was much steeper, which explains why the cave was little used at that time. Since 2005, several archaeological findings dating back more than 42,000 years have been made in the cave. The age of the findings was determined using radiocarbon dating. However, some findings might be older, as their level of Carbon-14

2862-536: Was collected during the excavation) only 268 belong to Nautilus pompilius . It is believed that the jewelry made of nautilus shells had a great cultural significance. The findings corroborate the theory that the anatomically modern man spread from Asia to Australia on the South route over the Lesser Sunda Islands and not on the northern route via Borneo , Sulawesi and New Guinea . Earlier findings on

2916-557: Was the first landfall for traders. The island has also been known by other names, including Andalas or Percha Island . Scholars suggest that mention of Suwarnadwipa in the Hindu Epic the Ramayana may be a reference to Sumatra. According to experts on The Ramayana , the epic is one of the first sources to document the relationship between India and the Indonesian archipelago. In the late 13th century, Marco Polo referred to

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