[6] Vihren is situated in the northern subdivision of Pirin on the mountain's main ridge between the summits of Kutelo (2,908 m) to the north-west and Hvoynati Vrah (2,635 m) to the south-east.

[4] Below the 450 m-high walls of Vihren facing Golemiya Kazan there is a small glacier called Snezhnika, which is Europe's southernmost glacial mass.

[6] Vihren is home to a number of habitats, including alpine and sub-alpine open calcareous grasslands that at inclination of 30–45° at altitude over 2,500 m on the marble bedrock forms phytocenosis dominated by Sesleria korabensis,[9] and alpine and sub-alpine closed calcareous grasslands on very rocky bedrock.

[9] There are also Alyssum cuneifolium, Bellardiochloa variegata, Bromus lacmonicus, Cerastium lanatum, Koeleria eriostachya, Onobrychis pindicola, Scutellaria alpina, Sesleria coerulans, etc.

[10] Rare or endemic herbaceous plants that grow on the slopes of Vihren are edelweiss (Leontopodium alpinum),[11] Pirin poppy (Papaver degenii),[12] Oxytropis urumovii,[13] Alyssum pirinicum,[14] Timmia norvegica,[15] Thymus perinicus,[16] etc.

[18] From the top there is a view to almost the whole of northern Pirin, as well as to the mountain ranges of Rila, Rhodope, Maleshevo, Ograzhden, Belasica and Slavyanka.