[2][3] Kamundan is mostly still natural with the upstream in Manokwari Regency and river mouth at the border of Bintuni Bay and Sorong Selatan Regency.

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

The warmest month is January when the average temperature is around 26 °C, and the coldest is February, at 22 °C.

[8] The Kamundan River has many trees on both banks as well as clear and calm water.

Some species can be found around this river including saltwater crocodiles, primates, a variety of hornbills, yellow-crested cockatoos, and bats.