Sekonyer is a river in southern Borneo, Central Kalimantan province, Indonesia, about 700 km northeast of the capital Jakarta.

[2] Part of the river traverses the Tanjung Puting National Park.

[2] Travel on the river is often done by klotok, an Indonesian riverboat.

[2] The river flows in the southern central area of Kalimantan with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

The warmest month is April when the average temperature is around 24 °C, and the coldest is December, at 21 °C.