Kostur dialect is spoken in the territory around the town of Kostur (Καστοριά) (Kostursko) in northwestern Greece, in the village of Vrъbnik (Vërnik) and in the town of Bilishcha (Bilisht) on Albanian territory, and in Novo Konomladi near Petrich in Bulgaria. To the southwest, Kostursko borders Epirus and Korchansko – a natural border is Mount Gramos with its foothills. To the north, the Vich mountain and the Nered mountain connect this area with Lerinsko. To the northwest the Gorbets mountain separates Kostursko from Dolnoprespansko, and the Snezhnik (Sinyachko) mountain, located in the southeast, separates it from Kaylyarsko and Kozhansko.







