Saimaa

Saimaa is a lake located in the Finnish Lakeland area in southeastern Finland. At approximately 4,400 square kilometres , it is the largest lake in Finland, and the fourth largest natural freshwater lake in Europe.It was formed by glacial melting at the end of the Ice Age. Major towns on the lakeshore include Lappeenranta, Imatra, Savonlinna, Mikkeli, Varkaus, and Joensuu. About 6000 years ago, ancient Lake Saimaa, estimated to cover nearly 9,000 km2 at the time, was abruptly discharged through a new outlet. The event created thousands of square kilometres of new residual wetlands. Following this event, the region saw a population maximum in the decades following only to later return to an ecological development towards old boreal conifer forests which saw a decline in population.

Author: Wikipedia