[4][5] The longhouses of the Pendahara are located along the river in its upper course.

The river has its source in the Schwaner Mountain Range.

[6] The river flows in the southeast area of Borneo with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

The warmest month is September, when the average temperature is around 24 °C, and the coldest is December, at 20 °C.

The wettest month is December, with an average of 476 mm rainfall, and the driest is September, with 75 mm rainfall.