Which of the following lakes is the highest navigable lake in the world?

Which lake is the largest in the Caucasus? What is the world's largest freshwater lake by surface area? Which of the Great Lakes is the deepest? In which country is Lake Baikal located? What is the name of the largest freshwater lake in Africa? Which of the Great Lakes is the smallest by surface area? Which of the following lakes is a saltwater lake? Which lake is the lowest point in Africa?