The Lawa River is a river in East Kalimantan province, Borneo island, Indonesia, about 150 km northwest of Balikpapan. It is a branch of the Mahakam River in eastern Borneo, which is situated entirely within the Kutai Barat and flows into the Mahakam approximately 200 km upstream from Samarinda. The indigenous communities of Lotaq and Mejaun (The Dayaks) are situated near its source.

Geography

The river flows in the eastern area of Borneo with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 23 C. The warmest month is October, when the average temperature is around 24 C, and the coldest is February, at 22 C. The average annual rainfall is 2939 mm. The wettest month is November, with an average of 354 mm of rainfall, and the driest is August, with a 124 mm of rainfall.