The river flows in the northern area of Papua with predominantly tropical [rainforest climate]. The annualaveragetemperature in the area is 22°C. The warmestmonth is June, when the average temperature is around 23 °C, and the coldest is February, at 22 °C. The average annual rainfall is 5380mm. The wettest month is March, with an average of 583 mm rainfall, and the driest is October, with 256 mm rainfall.