Which lake is the largest in the African Great Lakes by volume?

Which of the following deserts is the largest in the Middle East? 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? What is the largest lake in the European part of Russia? Which lake is the largest in Scandinavia? Which lake is the largest in the Ethiopian Highlands? Which lake is the largest in the Caucasus?