Which African landlocked country is completely surrounded by South Africa?

Which of the following landlocked countries in South America has a coastline on Lake Titicaca? Which landlocked country in South America has the highest population? Which African landlocked country is home to the ancient city of Great Zimbabwe? Which of the following landlocked countries in Asia has the largest land area? Which landlocked country in Asia shares the longest border with India? What is the smallest landlocked country in the world? Which landlocked country in Central Asia has the highest number of natural gas reserves? Which landlocked country in Africa is home to the Okavango Delta?