The Vjosa or Aoös is a river in northwestern Greece and southwestern Albania. Its total length is about 272 kilometres, of which the first 80 kilometres are in Greece, and the remaining 192 kilometres in Albania. Its drainage basin is 6,706 km and its average discharge is 195 m/s. The main tributaries are Voidomatis, Sarantaporos, Drino and Shushicë.