|Main source||Lake Toba, Porsea, Toba Samosir, North Sumatra|
|River mouth||Strait of Malacca|
|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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