Beysehir lake is the third largest lake in Turkey, and as a result of chemical reaction it has formed many islands, which are the remains of cavernous geological structures. The water is alkaline, and within it are carp, trout, bass, turtles and snakes. The islands provide a home for thousands of water birds who nest there, including swans, Montagu's Harrier, cormorants, ducks and divers. Species of trees here include juniper, black pine, firs, cedar and oak.