Which lake is located on the border of Tanzania, Uganda, and Kenya?

In which country is Lake Khövsgöl located? Which lake is the second-deepest lake in the world? In which country is Lake Poyang located? Which African lake is the source of the Nile River? Which lake is located in the Himalayas and is a sacred site in Hinduism? What is the largest lake in Central America? What is the largest lake in Turkey? What is the world's largest ocean?