Alas River is a river in Aceh in northeastern Sumatra, Indonesia, about 1400 km northwest of the capital Jakarta.[1][2] It is known for its white water rafting.[3]
The banks of the rivers are inhabited by the Alas people.[4]
Geography
The river flows in the northern area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[5] The annual average temperature in the area is 22 °C. The warmest month is March, when the average temperature is around 23 °C, and the coldest is June, at 21 °C.[6] The average annual rainfall is 2943 mm. The wettest month is December, with an average of 370 mm rainfall, and the driest is June, with 82 mm rainfall.[7]