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 21 °C. The warmest month is January, when the average temperature is around 24 °C, and the coldest is July, at 19 °C.[4] The average annual rainfall is 6225 mm. The wettest month is May, with an average of 807 mm rainfall, and the driest is July, with 341 mm rainfall.[5]
