The river flows in the southern area of Southwest 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 24 °C, and the coldest is August, at 22 °C.[4] The average annual rainfall is 4797 mm. The wettest month is June, with an average of 662 mm rainfall, and the driest is October, with 225 mm rainfall.[5]