What is the smallest landlocked country in the world?

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 African landlocked country is completely surrounded by South Africa? Which landlocked country in Asia shares the longest border with India? 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? Which of the following countries is a landlocked country in the Balkans? Which African landlocked country has a coastline on Lake Tanganyika?