The ecoregion includes the montane forests above 1000 meters elevation on the Bird's Head (also known as Vogelkop) and Bomberai peninsulas. The largest area is in the Arfak Mountains and Tamrau Mountains on the Bird's Head Peninsula, with smaller areas in the Fakfak and Kumafa mountains on the western Bomberai Peninsula, and the mountains of the eastern Womberoi Peninsula on Cenderawasih Bay. Mount Arfak (2955 m) is the highest point in the ecoregion. The Vogelkop-Aru lowland rain forests ecoregion occupies the surrounding foothills and lowlands.