Mariovo (Macedonian Cyrillic: Мариово) is a region in the southern part of Macedonia (area of 1,390 square km, elevation 1,050 m), situated between the mountains Sele?ka (highest peak - Visoka 1,471 m) on the west, Nid?e (highest peak - Kajmak?alan 2,520 m) and Ko?uf (highest peak - Zelenbeg 2,171 m) on the south, Kozjak (highest peak - Baltova ?uka 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.