The mountain is characterized as heaven for botanists due to its diversity in plants. Two lakes mark its Greek part:lake Doirani in the west and lake Kerkini on the east side. The river Strymonas separates Belasitsa from the mountain Aggistro.
Its rocks are composed of crystalline and form beautiful hillsides abounding in water streams. Valleys like “Purple lake” (“Mavi gol” in Turkish) and “Beautiful slope” above the village of Ano Poroia are unique. The most famous Greek peak is Isti-Bey at an altitude of about 1600 m but the highest peak is 2031 m (anonymous). Two international European roads cross the mountain - E4 starting from Bulgaria and E6 starting from Alexandroupoli, Greece.
There are lot of villages in the mountain: Kastanousa, Platanakia, Makrinitsa, Ano Poroia, Kato Poroia, Akritochori, Omalo-Thrakiko, Mandraki, Vyroneia, Neo Petrichi and the very close Rodopoli, Livadia and Kerkini.
The mountain is part of Lake Kerkini National Park and 255,500 hectares are considered as Special Protected Area under the code OROS BELLES, GR1260001. It is very important area for predators like Haliaeetus albicilla, Aquila clanga, Aquila heliacal, Falco naumanni.