[1][2] The river flows in the southern area of Papua with a predominantly tropical monsoon climate (designated as Am in the Köppen-Geiger climate classification).

[3] The annual average temperature in the area is 23 °C.

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

[4] The average annual rainfall is 2155 mm.

The wettest month is February, with an average of 356 mm of rainfall, and the driest is August, with 16 mm of rainfall.