The Jelai-Bila River is a river of Central Kalimantan, Indonesia, about 600 km northeast of the capital Jakarta.

[2] The river flows in the central south of Borneo with a predominantly tropical monsoon climate (designated as Am in the Köppen-Geiger climate classification).

The warmest month is September when the average temperature is around 26 °C, and the coldest is January, at 20 °C.

[4] The average annual rainfall is 2760 mm.

The wettest month is December, with an average of 531 mm of rainfall, and the driest is September, with 45 mm of rainfall.