Rila is a mountain range in southwestern Bulgaria and the highest mountain range of Bulgaria and the Balkans, with its highest peak being Musala at 2,925 m. The range is the sixth highest in Europe, coming after the among others, the Alps, the Pyrenees and Mount Etna; and the highest between the Alps and the Caucasus. The larger part of the mountain is occupied by Rila National Park.
The Seven Rila Lakes are a group of lakes of glacial origin (glacial lakes), situated in the northwestern Rila Mountains. They are the most visited group of lakes in Bulgaria and are situated between 2,100 and 2,500 metres elevation above sea level.
Each lake carries a name associated with its most characteristic feature. The highest one is called Salzata ( “The Tear” ) due to its clear waters that allow visibility in depth. The next one in height carries the name Okoto ( “The Eye” ) after its almost perfectly oval form. Okoto is the deepest cirque lake in Bulgaria, with a depth of 37.5 m. Babreka ( “The Kidney” ) is the lake with the steepest shores of the entire group. Bliznaka ( “The Twin” ) is the largest one by area. Trilistnika ( “The Trefoil” ) has an irregular shape and low shores. The shallowest lake is Ribnoto Ezero ( “The Fish Lake” ) and the lowest one is Dolnoto Ezero ( “The Lower Lake” ), where the waters that flow out of the other lakes are gathered to form the Dzherman River.