Asahan River

Asahan River Sungai Asahan, Aek Asahan
Spring of Asahan River at Porsea, Toba Samosir (1929)
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Location
Country	Indonesia
Physical characteristics
Source
• location	Lake Toba, Porsea, Toba Samosir, North Sumatra
• coordinates	2.434866, 99.147690
• elevation	950 m
Mouth
• location	Strait of Malacca
• coordinates	3.03333°N 99.866667°E
• elevation	0 m
Length	147 km (91 mi)
Basin size	3741 km²
Discharge
• average	155 m³/s

Asahan River (Indonesian: Sungai Asahan) is one of the principal rivers in North Sumatra, Indonesia, that begins in Porsea, Toba Samosir Regency at the Southeast part of Lake Toba.^[1]

Hydrology[]

The river flows toward a north-easterly direction, cutting through the upper course of the deep valley in the Barisan Mountains in Toba Samosir Regency, then flows through the Asahan Regency and eventually empties into the Strait of Malacca

The largest city on the Asahan is Tanjungbalai, Asahan with a population of more than 150,000 people. The river houses the Sigura-gura Dam, which supplies power to the North Sumatran Province.

Tributaries of the Asahan include the Silang, Silau, Nantalu, Masihi, Lauran, and Baru River.

Geography[]

The river flows along the northeast area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).^[2] The annual average temperature in the area is 23 °C. The warmest month is March, when the average temperature is around 25 °C, and the coldest is May, at 23 °C.^[3] The average annual rainfall is 2950 mm. The wettest month is November, with an average of 381 mm rainfall, and the driest is June, with 117 mm rainfall.^[4]

See also[]

• List of rivers of Sumatra
• List of rivers of Indonesia

References[]