The river flows in the southwest area of Sulawesi with a predominantly tropical monsoon climate (designated as Am in the Köppen-Geiger climate classification).[3] The annual average temperature in the area is 23°C. The warmest month is October when the average temperature is around 25°C, and the coldest is July, at 21°C.[4] The average annual rainfall is 2550mm. The wettest month is January, with an average of 404mm of rainfall, and the driest is September, with 29mm of rainfall.[5]