The Asahan River ( id, Sungai Asahan) is one of the principal rivers in

North Sumatra North Sumatra ( id, Sumatra Utara) is a province of Indonesia located on the northern part of the island of Sumatra. Its capital and largest city is Medan. North Sumatra is Indonesia's fourth most populous province after West Java, East Java and ...

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

, that begins in Porsea,

Toba Samosir Regency Toba Regency is a landlocked regency in North Sumatra. Its seat is Balige. The regency covers an area of 2,021.8 square kilometres; it had a population of 173,129 at the 2010 censusBiro Pusat Statistik, Jakarta, 2011. and 206,199 at the 2020 Censu ...

at the Southeast part of

Lake Toba Lake Toba ( id, Danau Toba) ( Toba Batak: ᯖᯀᯬ ᯖᯬᯅ; romanized: ''Tao Toba'') is a large natural lake in North Sumatra, Indonesia, occupying the caldera of a supervolcano. The lake is located in the middle of the northern part of the ...

.Sungai Asahan
at Geonames.org (cc-by); Last updated 2013-06-04; Database dump downloaded 2015-11-27

Hydrology

The river flows toward a north-easterly direction, cutting through the upper course of the deep valley in the

Barisan Mountains The Bukit Barisan or the Barisan Mountains are a mountain range on the western side of Sumatra, Indonesia, covering nearly 1,700 km (1,050 mi) from the north to the south of the island. The Bukit Barisan range consists primarily of volca ...

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 A tropical rainforest climate, humid tropical climate or equatorial climate is a tropical climate sub-type usually found within 10 to 15 degrees latitude of the equator. There are some other areas at higher latitudes, such as the coast of southea ...

(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 25 °C, and the coldest is May, at 23 °C. 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.

References

{{Rivers of Sumatra Lake Toba Rivers of North Sumatra Rivers of Indonesia

Hydrology

Geography

See also

References