Asahan River

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]

Asahan River
Sungai Asahan, Aek Asahan
Spring of Asahan River at Porsea, Toba Samosir (1929)
Location
CountryIndonesia
Physical characteristics
Source 
 • locationLake Toba, Porsea, Toba Samosir, North Sumatra
 • coordinates2.434866, 99.147690
 • elevation950 m
Mouth 
 • location
Strait of Malacca
 • coordinates
3.03333°N 99.866667°E
 • elevation
0 m
Length147 km (91 mi)
Basin size3741 km²
Discharge 
 • average155 m³/s

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]

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See also

References
  1. Sungai Asahan at Geonames.org (cc-by); Last updated 2013-06-04; Database dump downloaded 2015-11-27
  2. Peel, M C; Finlayson, B L; McMahon, T A (2007). "Updated world map of the Köppen-Geiger climate classification". Hydrology and Earth System Sciences. 11. doi:10.5194/hess-11-1633-2007.
  3. "NASA Earth Observations Data Set Index". NASA. 30 January 2016.
  4. "NASA Earth Observations: Rainfall (1 month - TRMM)". NASA/Tropical Rainfall Monitoring Mission. 30 January 2016.
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