Bongka RiverThe Bongka River is a river in Central Sulawesi, Indonesia, about 1700 km northeast of capital JakartaGeographyThe river flows in the central area of Sulawesi island with predominantly tropical rainforest climate. 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. 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.