Asahan River

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Country Indonesia
Physical characteristics
Main source Lake Toba, Porsea, Toba Samosir, North Sumatra
950 m
2.434866, 99.147690
River mouth Strait of Malacca
0 m
3.03333°N 99.866667°E
Length 150 km
  • Average rate:
    155 m³/s
Basin features
Basin size 3741 km²

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

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