[9] The Sampit flows into the Java Sea at 2°58′20″S 113°2′23″E / 2.97222°S 113.03972°E / -2.97222; 113.03972.

The river flows in the midsouthern area of Borneo island with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

[10] The annual average temperature in the area is 23 °C.

The warmest month is July, when the average temperature is around 25 °C, and the coldest is November, at 22 °C.

The wettest month is December, with an average of 476 mm rainfall, and the driest is September, with 82 mm rainfall.