Belasica (Macedonian and Bulgarian: , also translit. Belasitsa or Belasitza, Ottoman Turkish: بلش Turkish: Beleş), Belles (Greek: Μπέλλες, Bélles) or Kerkini (Greek: Κερκίνη, Kerkíni;), is a mountain range in the region of Macedonia in Southeastern Europe, shared by northeastern Greece (about 45%), southeastern North Macedonia (35%) and southwestern Bulgaria (20%).