The Poso is a river of Central Sulawesi on Sulawesi island, Indonesia, about 1600 km northeast of the capital Jakarta. The Poso is approximately 100 km long and flows from Lake Poso, about 2 km west of the town of Tentena to the city of Poso and then into the Gulf of Tomini.

Geography

The river flows in the central area of Sulawesi with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 22 C. The warmest month is October, when the average temperature is around 23 C, and the coldest is January, at 20 C. The average annual rainfall is 2715 mm. The wettest month is December, with an average of 368 mm rainfall, and the driest is September, with a 66 mm rainfall.

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