The The Thracians called it Orbelus (the snowy mountain), and later on the Slavonic tribes that invaded the Balkan Peninsula started to call it Perun (Pirin) after the name of their supreme god. The Pirin mountain is very impressive with limestone and granite aretes, sharp pointed pyramidal peaks, deep corries and beautiful glacial lakes. The steep slopes of the mountain are covered by dense forests of white and black fir, spruce, white and black pine, and dwarf pine. Herds of chamois wander in the most secluded areas. The foothills of the mountain abound with hot mineral springs, orchards and vineyards.