Perućica
Perućica is one of the last remaining primeval forests in Europe. It is located in Bosnia and Herzegovina, near the border with Montenegro. It is part of the Sutjeska National Park. Perućica Forest Reserve is long, wide, and has an area of . It is a UNESCO recognized site. The forest has many trees that are 300 years old, and the primeval forest's vintage is stated to be 20,000 years. In some stretches the forest growth is almost impenetrable, and the forest can only be explored in the company of rangers.