The river flows in the northern area of Papua with predominantly tropical rainforest climate. The annual averagetemperature in the area is 21 °C. The warmestmonth is April, when the average temperature is around 22 °C, and the coldest is January, at 20 °C. The average annual rainfall is 4839 mm. The wettest month is January, with an average of 579 mm rainfall, and the driest is July, with 205 mm rainfall.