page_title: Sarawak
section_title: Geography
hierarchical_section_title: Sarawak / Environment / Geography
caption_attribution_description: English: Julan waterfall 01
context_page_description: Sarawak is a state of Malaysia. The largest among the 13 states, with an area almost equal to that of Peninsular Malaysia, Sarawak is located in northwest Borneo Island, and is bordered by the Malaysian state of Sabah to the northeast, Kalimantan to the south, and Brunei in the north. The capital city, Kuching, is the largest city in Sarawak, the economic centre of the state, and the seat of the Sarawak state government. Other cities and towns in Sarawak include Miri, Sibu, and Bintulu. As of the 2015 census, the population of Sarawak was 2,636,000. Sarawak has an equatorial climate with tropical rainforests and abundant animal and plant species. It has several prominent cave systems at Gunung Mulu National Park. Rajang River is the longest river in Malaysia; Bakun Dam, one of the largest dams in Southeast Asia, is located on one of its tributaries, the Balui River. Mount Murud is the highest point in Sarawak.
  The earliest known human settlement in Sarawak at the Niah Caves dates back 40,000 years. A series of Chinese ceramics dated from the 8th to 13th century AD was uncovered at the archaeological site of Santubong.
context_section_description: The total land area of Sarawak is nearly 124,450 square kilometres (48,050 sq mi), making up 37.5 per cent of the total area of Malaysia, and lies between the northern latitudes 0° 50′ and 5° and eastern longitudes 109° 36′ and 115° 40′ E. Its 750 kilometres (470 mi) of coastline is interrupted in the north by about 150 kilometres (93 mi) of Bruneian coast. A total of its 45.5 kilometres (28.3 mi) coastline have been eroding. In 1961, Sarawak including neighbouring Sabah, which had been included in the International Maritime Organization (IMO) through the participation of the United Kingdom, became joint associate members of the IMO. Sarawak is separated from Kalimantan Borneo by ranges of high hills and mountains that are part of the central mountain range of Borneo. These become loftier to the north, and are highest near the source of the Baram River at the steep Mount Batu Lawi and Mount Mulu. Mount Murud is the highest point in Sarawak.
  Sarawak has a tropical geography with an equatorial climate and experiences two monsoon seasons: a northeast monsoon and a southwest monsoon. The northeast monsoon occurs between November and February, bringing heavy rainfall while the southwest monsoon, which occurs between March and October, brings somewhat less rainfall. The climate is stable throughout the year except for the two monsoons, with average daily temperature varying between 23 °C (73 °F) in the morning to 32 °C (90 °F) in the afternoon at coastal areas. Miri has the lowest average temperatures in comparison to other major towns in Sarawak and has the longest daylight hours (more than six hours a day), while other areas receive sunshine for five to six hours a day. Humidity is usually high, exceeding 68 per cent, with annual rainfall varying between 330 centimetres (130 in) and 460 centimetres (180 in) for up to 220 days a year. At highland areas, the temperature can vary from 16 °C (61 °F) to 25 °C (77 °F) during the day and as low as 11 °C (52 °F) during the night.
  Sarawak is divided into three ecoregions. The coastal region is rather low-lying and flat with large areas of swamp and other wet environments. Beaches in Sarawak include Pasir Panjang and Damai beaches in Kuching, Tanjung Batu beach in Bintulu, and Tanjung Lobang and Hawaii beaches in Miri. Hilly terrain accounts for much of the inhabited land and is where most of the cities and towns are found. The ports of Kuching and Sibu are built some distance from the coast on rivers while Bintulu and Miri are close to the coastline where the hills stretch right to the South China Sea. The third region is the mountainous region along the Sarawak–Kalimantan border, where a number of villages such as Bario, Ba'kelalan, and Usun Apau Plieran are located. A number of rivers flow through Sarawak, with the Sarawak River being the main river flowing through Kuching. The Rajang River is the longest river in Malaysia, measuring 563 kilometres (350 mi) including its tributary, Balleh River. To the north, the Baram, Limbang and Trusan Rivers drain into the Brunei Bay.
  Sarawak can be divided into two geological zones: the Sunda Shield, which extends southwest from the Batang Lupar River (near Sri Aman) and forms the southern tip of Sarawak, and the geosyncline region, which extends northeast to the Batang Lupar River, forming the central and northern regions of Sarawak. The oldest rock type in southern Sarawak is schist formed during the Carboniferous and Lower Permian times, while the youngest igneous rock in this region, andesite, can be found at Sematan. Geological formation of the central and northern regions started during the late Cretaceous period. Other types of stone that can be found in central and northern Sarawak are shale, sandstone, and chert. The Miri Division in eastern Sarawak is the region of Neogene strata containing organic rich rock formations which are the prolific oil and gas reserves. The rocks enriched in organic components are mudstones in Lambir, Miri and Tukau Formations of Middle Miocene-Lower Pliocene age. Significant quantities of Sarawak soil are 
caption: Julan waterfall (located at Usun Apau Plieran) is the highest waterfall in Sarawak[116]
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