[1] It is known for its forest landscapes, rich biodiversity, medicinal mineral water springs, natural and cultural monuments, and extensive network of hiking trails.

The national park stretches over the slopes of the Pambak, Areguni, Miapor, Ijevan (Kaeni) and Halab mountain ranges at the altitude of 1070–2300 m above sea level.

It mainly consists of deciduous species such as oak (Quercus iberica, Q. macranthera), oriental beech (Fagus orientalis), common and oriental hornbeam (Carpinus betulus, C. orientalis), which form homogeneous oak, beech and hornbeam forests as well as mixed forests with different combinations of the species mentioned.

Coniferous forests (pine - Pinus, juniper - Juniperus and yew - Taxus) occupy a limited territory in the national park and occur in patches.

Pine often makes dense forests in the basin of the River Hovajur on the slopes of the Areguni and Pambak ranges in the vicinity of serpentine Dilijan highway.

The second smaller yew forest has been located on the upper stream of the River Aghstev in the gorge Frolova Balka of the Pambak Mountains.

Botanists N. Troitski in 1939 and A. Takhtajan in 1954 reported that this younger forest consisting of 100- to 180-, sometimes 220-year-old trees stretched for 4–5 km from the seventh kilometer of Dilijan highway towards Fioletovo village.

); amphibians: lake frog (Rana ridibunda), green toad (Bufotes viridis); fish: trout (Salmo trutta fario), barbel or Kura beghlou (Barbus lacerta cyri).

Over 40 species of mammals are registered in the national park such as red deer (Cervus elaphus), brown bear (Ursus arctos), fox (Vulpes vulpes), lynx (Lynx), wolf (Canis lupus), wild boar (Sus scrofa), wild cat (Felis silvestris), roe (Capreolus capreolus), badger (Meles meles), squirrel (Sciurus anomalus) and others.

Dilijan National Park is important for the conservation of forest landscapes, recreation and health protection purposes, as well as economic activities due to the presence of favorable conditions.