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

It is a tributary of the Kumai River and is fed by the Camp Leakey River.

Part of the river traverses the Tanjung Puting National Park. Travel on the river is often done by klotok, an Indonesian riverboat. The river includes an orangutan habitat. The river is brown and murky. Gold mining takes place along it.

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 annual average temperature in the area is 22 °C. The warmest month is April when the average temperature is around 24 °C, and the coldest is December, at 21 °C. The average annual rainfall is 2778 mm. The wettest month is November, with an average of 386 mm of rainfall, and the driest is September, with 66 mm of rainfall.

Sekonyer River
Climate chart (explanation)
J F M A M J J A S O N D     198     23 20     270     24 20     305     22 22     339     26 21     282     24 22     207     23 21     118     22 21     132     26 20     66     26 21     147     24 21     386     23 21     329     22 20 █ Average max. and min. temperatures in °C █ Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     7.8     73 68     11     75 68     12     72 72     13     79 70     11     75 72     8.1     73 70     4.6     72 70     5.2     79 68     2.6     79 70     5.8     75 70     15     73 70     13     72 68 █ Average max. and min. temperatures in °F █ Precipitation totals in inches

• List of drainage basins of Indonesia
• List of rivers of Indonesia
• List of rivers of Kalimantan

• Kalimantan 2: Sekonyer River to Camp Leakey YouTube video
• Wild Orang Utans near the Sekonyer River on Borneo YouTube video
• Photos of Sekonyer by Mike Helliwell