What is the largest lake in the European part of Russia?

In which continent is the Australian Outback located? What is the largest of the Great Lakes by surface area? What is the largest lake in Southeast Asia? Which lake is the largest in the African Great Lakes by volume? Which lake is the largest in Scandinavia? Which lake is the largest in the Ethiopian Highlands? Which lake is the largest in the Caucasus? What is the world's largest freshwater lake by surface area?