Southeastern Macedonian dialects in the context of "Štip"

The Kostur dialect (Macedonian: Костурски дијалект, Kosturski dijalekt) is a member of the Southwestern subgroup of the Southeastern group of dialects of the Macedonian language. This dialect is mainly spoken in and around the town of Kastoria, known locally in Macedonian as Kostur, and in the surrounding Korešta region, (Macedonian: Корешта; in the Kostur dialect: Korèshcha/Корèшча) which encompasses most of the area to the northwest of the town. The Kostur dialect is also partially spoken in Albania, most notably in Bilisht and the village of Vërnik (Vrabnik). The dialect is partially preserved among the ″people of Bulgarian origin in Mustafapaşa and Cemilköy, Turkey, descending from the village of Agios Antonios (Zhèrveni) in Kostur region (Aegean Macedonia)″.

The Kostur dialect shares strong similarities with the Nestram-Kostenar dialect and the Korča dialect. Bulgarian linguist Stoyko Stoykov regarded the Nestram dialect as a subgroup of the Kostur dialect, part of Bulgarian dialects. Other Bulgarian linguists also regard the dialect as a Bulgarian dialect.