Bolshoy Yeravna
Bolshoy Yeravna (; ) is a fresh water body in the Yeravninsky District, Buryatia, Russia. Common roach, perch, crucian carp, pike, burbot, minnow, are among the native fish species in the lake. Peled, bream and carp have been introduced. Legend says that the origin of the lake and the adjacent ones is in a big hot rock that fell to the earth and broke into big and small pieces that made holes which filled with water. Geography The lake is part of the Yeravna-Khorga Lake System (), which includes 6 large lakes and a number of smaller ones. Bolshoy Yeravna (Big Yeravna) is the largest of the group. The catchment area of the lake is located in a forest steppe zone. The lakeshore is low and gentle, with grassland and bushes. Bolshoy Yeravna has a roughly round shape and is fed by three small rivers, the Tuldun, Indola and Zhipkesen. In the southwestern side it has an outlet, a small sound connecting with neighboring Lake Sosnovo. To the east lies Maly Yeravna lake. When the water levels are high the Yeravna lakes are connected with each other by intermittent channels. The outlet of the lake area is via the Khorga