The river flows in the southwest area of Java with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 24 °C. The warmest month is September, when the average temperature is around 26 °C, and the coldest is December, at 22 °C. The average annual rainfall is 2907 mm. The wettest month is December, with an average of 410 mm rainfall, and the driest is June, with 137 mm rainfall.