The Bongka River is a river in Central Sulawesi, Indonesia, about 1700 km northeast of capital Jakarta[2][3] The river flows in the central area of Sulawesi island with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

[4] The annual average temperature in the area is 23 °C.

The warmest month is October, when the average temperature is around 24 °C, and the coldest is April, at 22 °C.

[5] The average annual rainfall is 2929 mm.

The wettest month is April, with an average of 341 mm rainfall, and the driest is September, with 79 mm rainfall.