| Poso River | |
| Name Other: | ,, |
| Map Size: | 285 |
| Pushpin Map: | Indonesia Sulawesi#Indonesia |
| Pushpin Map Size: | 285 |
| Pushpin Map Caption: | Location of river mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Indonesia |
| Subdivision Type2: | State |
| Subdivision Name2: | Central Sulawesi |
| Subdivision Type3: | Region |
| Discharge1 Location: | Near mouth |
| Discharge1 Avg: | [1] |
| Source1: | Lake Poso |
| Source1 Location: | Tentena |
| Mouth: | Gulf of Tomini |
| River System: | Poso River |
| Basin Size: | [2] |
The Poso is a river of Central Sulawesi on Sulawesi island, Indonesia, about 1600 km northeast of the capital Jakarta.[3] 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.[4]
The river flows in the central area of Sulawesi with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[5] The annual average temperature in the area is 22C. The warmest month is October, when the average temperature is around 23C, and the coldest is January, at 20C.[6] The average annual rainfall is 2715mm. The wettest month is December, with an average of 368mm rainfall, and the driest is September, with a 66mm rainfall.[7]