[3] The Public Forest System Utility Program (Program Pemberdayaan Sistem Hutan Kerakyatan; PPSHK) has a scheme on the river aimed at reducing the level of mercury content absorbed by humans.

[4] The river flows through the dense rainforest of Borneo.

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

The warmest month is August when the average temperature is around 24 °C, and the coldest is November, at 20 °C.

[7] During the 1880s the river was exploited for its Cinnabar and antimony in its far upper course.