Russia's Lake Onega is the second largest lake in Europe, located in the northwest of the country. It is a freshwater lake that covers an area of 9, 700 square miles and has a maximum depth of over 700 feet. The lake is fed by several rivers, including the Volga, and is connected to the Baltic Sea by the Svir River. It is a popular tourist destination, with many resorts and activities available on its shores.