[4] The river has its source near Bikit Tikung (1,175 metres) in the Schwaner Mountain Range.

[5] The eastern side of the river contains dense forest down to Sembulu (Belajau) lakes and is said to be a major habitat of the orangutan.

[6] The river flows in the middle to the south of Borneo island with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

The warmest month is November, when the average temperature is around 26 °C, and the coldest is February, at 23 °C.

[9] The Seruyan River (previously named Seroejan) is a river that crosses and flows in the Seruyan Regency, Central Kalimantan province, Indonesia.