The primeval beech forest Dlaboka Reka evolved in the valley of the river Dlaboka Reka on Korab Mountain within the strict protection zone of Mavrovo National Park. The beech forest is characterised by natural processes with almost no human intervention in the last 100 years. The European beech (Fagus sylvatica) is the dominant tree species, while the Macedonian fir (Abies borisii-regis) is present in the lower parts of the valley.
Avalanches are frequent due to the very steep slopes and thick snow cover in winter. As a result, most of the beech forest area is frequently disturbed and large quantities of deadwood are present in the lowest parts of the valley. The largest and oldest beech trees can be found in the upper parts of the valley, which are less steep. The area is very rich in biodiversity, with the presence of numerous endemic species of plants and invertebrates. It is also important for the conservation of the Balkan lynx, the Balkan chamois, the Golden eagle, and many other vertebrate species.
- UNESCO recognition: 2021
- Protected area: Mavrovo National Park
- Beech forest region: Moesian-Balcanic
- Area: 193.27 ha
- Number of component parts: 1
- Altitudinal range: montane (1,250 - 1,900 m above sea level)
- Fauna: Balkan lynx, Balkan chamois, Wolf, European wildcat, Golden eagle, important saproxylic and endemic beetles (Pterostichus bruckii, Pterostichus lumensis litae, Molops rufipes steindachneri, Molops sturanyi)
- Coordinates of the Central Point: N 41° 45’ 47’’, E 20° 35’ 16’’