Barumun River is a Sumatran river that begins in Siraisan, Padang Lawas Regency in the southeastern North Sumatra,

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 ...

, about 1200 km northwest of the capital

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.Sungai Barumun
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Hydrology

The river flows northward through North Padang Lawas,

South South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþaz' ...

and Labuhan Batu Regency before it reaches Sumatra east coast with its estuary in

Malacca Strait The Strait of Malacca is a narrow stretch of water, 500 mi (800 km) long and from 40 to 155 mi (65–250 km) wide, between the Malay Peninsula ( Peninsular Malaysia) to the northeast and the Indonesian island of Sumatra to the southwest, co ...

. The largest city on the Barumun is Kotapinang, South Labuhan Batu, with a population of 54.000 people. While the largest city in the Barumun basin is Rantau Prapat, which is located on the Bilah with a population of 164.000 people. It is the largest river in Sumatra with length at about 440 km. Tributaries include the Bilah, Kanan, Batang Pane, Sihapas and Aek Sangkilon. All tributaries of Barumun River are sourced from mountainous areas along Barisan Mountains.

Geography

The river flows in the northern 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 southeas ...

(designated as ''Af'' in the Köppen-Geiger climate classification). The annual average temperature in the area is 23 °C. The warmest month is May, when the average temperature is around 25 °C, and the coldest is January, at 22 °C. The average annual rainfall is 2801 mm. The wettest month is November, with an average of 381 mm rainfall, and the driest is March, with 126 mm rainfall.

References

{{Rivers of Sumatra Rivers of North Sumatra Rivers of Indonesia

Hydrology

Geography

See also

References