The Belayan River is a river of Borneo, Indonesia, 1300 km northeast of the capital Jakarta.Rand McNally, The New International Atlas, 1993. It is a tributary of the Mahakam River.Sungai Belayan at Geonames.org (cc-by); Last updated 17 January 2012; Database dump downloaded 27 November 2015

Hydrology

The river traverses three districts in the upstream area of Kutai Kartanegara Regency, namely Kenohan, Kembang Janggut, and Tabang.Sungai Belayan, Urat Nadi Warga Hulu Kukar. STV Samarinda. 21 March 2018. The high flow rate during flooding constantly eroded the land on the river banks, causing damage to the houses built next to it.Air Sungai Belayan terus Menggerus Tanah, 30 Rumah sudah Dibongkar. Penulis: Rahmad Taufik. Editor: Adhinata Kusuma. Sumber: Tribun Kaltim. 22 November 2018. Belayan flows into the Mahakam River near Muhuran, Kotabangun, and Bukit Tinjawang.Sungai Belayan. MapCarta

Geography

The river flows in the eastern area of Borneo island with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 23 °C. The warmest month is March, when the average temperature is around 24 °C, and the coldest is January, at 22 °C. The average annual rainfall is 2780 mm. The wettest month is December, with an average of 351 mm of rainfall, and the driest is August, with 138 mm of rainfall.

Discharge

Average, minimum, and maximum discharge of the Belayan River at Tabang (). The period from 1990 to 2008. YearDischarge (m3/s)YearDischarge (m3/s)Min Mean Max MinMeanMax1990132.82300.67590.562000350.04540.76790.451991313.75480.6893.622001394.12944.691,503.171992117.44300.41543.392002178.53472.19736.781993112.01238.82450.932003156.95288.34467.1199467.8186.53279.972004108.71228.57463.381995100.42148.46250.82005234.99389.65635.44199681.73252.5627.21200699.83431.14700.151997184.88438.65600.432007218.45428.36637.981998143.9398.19675.272008346.84536.21788.891999332.56590.9830.6567.8400.1431,503.17

Width and depth

LocationBelayanMahakamWidth (m)Depth (m)Width (m)Depth (m)Kenohan –12016Kembang Janggut 18026Loa Kulu 27028Kota Bangun 32018Muara Muntai 29022

Uses The Belayan River is vital for the population along its banks for transportation, water source for daily life, and also for occupation for some inhabitants, such as fish and gold. The river is important for the people of three districts, Kenohan, Kembang Janggut, and Tabang, even for centuries was the only access route to those three districts. Upstream of Belayan, there are some villages of the Dayak Kenyak tribe, such as Ritan Baru, Tabang District, which can be reached in about one or two days by boat or ferry from Samarinda.Guide recommendations for Sungai Mahakam and Kutai?. Trip Advisor. 22 February 2014, 10:47 pm It took about two days and one night to travel from Tabang to Tenggarong using river transportation. The local Dayak tribe is known for wood sculptures and other handicrafts.

Along the river, there are many ports to transport coals from the mines in Kutai Kartanegara for export.

Due to sedimentation, the Belayan River needs to be dredged regularly, so that it flows steadily downstream and doesn't cause much flooding.Sungai Belayan akan Dikeruk. Koran Kaltim. 8 August 2017.

Ecology The Belayan River is a habitat of the Mahakam or Irrawaddy dolphin (Orcaella brevirostris), one of the river animals in the IUCN Red List of Threatened Species, and also of little egret (Egretta garzetta). Sungai Belayan, Anak Sungai Mahakam Dalam Bingkai Imaji. Yunaidi Joepoet. Ransel Kosong. Oktober 2013.

See also List of drainage basins of Indonesia List of rivers of Indonesia List of rivers of Kalimantan

References

Further reading Konsepsi pola penatagunaan hutan secara mikro, daerah aliran sungai Belayan, propinsi Dati I Kalimantan Timur. Banjarbaru, 1980.