The river flows in the southwest of Timor with predominantly tropical savanna climate (designated as Aw in the Köppen–Geiger climate classification system).[4] The annual average temperature in the area is 25 °C. The warmest month is October, when the average temperature is around 28 °C, and the coldest is February, at 22 °C.[3] The average annual rainfall is 1575 mm. The wettest month is January, with an average of 297 mm, and the driest is September, with 6 mm rainfall.[5]