[1][2] The river flows in the southern 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 23 °C.

The warmest month is December, when the average temperature is around 25 °C, and the coldest is July, at 21 °C.

[4] The average annual rainfall is 6240 mm.

The wettest month is August, with an average of 690 mm rainfall, and the driest is January, with 402 mm rainfall.