Volujak is a mountain range on the border of Bosnia and Herzegovina and Montenegro. Geologically, Volujak is a subrange of the Dinaric Alps and formed largely of secondary and tertiary sedimentary rock, mostly limestone and dolomite. It basically forms a long ridge on the southwest side of the Suhja valley, with the border between Bosnia-Herzegovina and Montenegro running alongside this ridge, where a sharp corner of BiH territory reaches into Montenegro. It is on the BiH side located within the Sutjeska National Park but has a protected status also on the Montegrin side. Notable peaks are Volujak (), Studenac (), Badnjine () and Trnovački Durmitor (). Right at the northern foot of this last peak is the beautiful Trnovačko Lake situated. The Volujak range borders north-east on the Suhja valley and Maglić, on the south west side on the Izgori valley and the Lebršnik mountain group, in the north west by the Sutjeska (river) valley and on the south east side by the Bioč range. Volujak peak is the second highest elevation point in Bosnia Herzegovina. From its summit hikers obtain an impressive view of the surrounding peaks: Maglić, Veliko Vitao and, in the distance, Durmitor.