What is the largest of the Great Lakes by volume?

Which African lake is the deepest? What is the largest freshwater lake in South America? Which of the Great Lakes is the shallowest? Which lake is the world's largest saltwater lake? In which country is Lake Victoria located? In which country is Lake Issyk-Kul located? In which country is Lake Onega located? In which country is Lake Khövsgöl located?