The river flows in the northern area of Papua with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

[3] The annual average temperature in the area is 21 °C.

The warmest month is July, when the average temperature is around 22 °C, and the coldest is March, at 20 °C.

[4] The average annual rainfall is 3489 mm.

The wettest month is March, with an average of 444 mm rainfall, and the driest is July, with 162 mm rainfall.