Geologically, the Prenj range is part of the Dinaric Alps and formed largely of secondary and tertiary sedimentary rock, mostly limestone and dolomite with notable characteristics of a karst landform.

Notable peaks are Zelena Glava (2115 m), Lupoglav (2102 m), Otiš (2097 m), Herač (2046 m), Osobac (2030 m) and Velika Kapa (2007 m).

Contamination with land mines and unexploded ordnance is a serious threat, especially east of a line that can be drawn from Čelebići to the summit of Zelena Glava and then to the village of Ravni.

The peaks bear typical dolomitic features with vertical rock faces, soaring over green alpine valleys and dense mixed forests.

Some mountain huts have re-opened (Bijele Vode, Hrasnica) and marked itineraries to the main peaks have been re-established.