The Kumawa Mountains are a coastal range located on the southwestern Bomberai Peninsula.

They are in West Papua Province in the Indonesian portion of New Guinea.

Rainwater eroding the limestone has created large areas of karst landscape, with caverns, sinkholes, and relatively few surface streams despite high rainfall.

Typical lowland rain forest trees are Alstonia scholaris, Burckella sp., Calophyllum sp., Cananga odorata, Canarium indicum, Falcataria falcata, Intsia bijuga, Intsia palembanica, Palaquium sp., Planchonella sp., Pometia pinnata, Spondias cytherea, and Terminalia sp.

Common montane rain forest species in karstic areas are Anisoptera polyandra, Casuarina sp., Elaeocarpus sp., Intsia sp., Octomeles sumatrana, Palaquium sp., Podocarpus idenburgensis, and Spondias dulcis.