The river flows in the southern area of Papua with a predominantly
tropical rainforest climate (designated as
Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 23 °C. The warmest month is October when the average temperature is around 25 °C, and the coldest is June, at 20 °C. The average annual rainfall is 2952 mm. The wettest month is May, with an average of 405 mm rainfall, and the driest is August, with 62 mm rainfall. == Ecology ==