Mariovo (Macedonian Cyrillic: Мариово) is a historic region in the southern part of Republic of Macedonia (area of 1,390 square km, elevation 1,050 m), situated between the mountains Selečka (highest peak - Visoka 1,471 m) on the west, Nidže (highest peak - Kajmakčalan 2,520 m) and Kožuf (highest peak - Zelenbeg 2,171 m) on the south, Kozjak (highest peak - Baltova Čuka 1,822 m) on the east and Dren mountain (highest peak - Studenica 1,663 m) on the north. The river Crna flows across the whole area of Mariovo, creating the largest canyon in Macedonia which is around 100 km long.