Ethiopia is a diverse and world-class stage for natural beauty and wildlife viewing, although the tourism industry is poorly developed. There are over 845 species of birds and 260 species of mammals, of which 50 are indigenous only to Ethiopia. Important areas of interest are Blue Nile Falls, Tana Lake (largest in Ethiopia), Simiem Mountains (3rd highest in Africa), Rift Valley lakes and the Sof Omar Caves in the south province.