The Iguazu Falls are a UNESCO natural World Heritage site located on the border of which two countries?

What is the name of the famous cave system in Vietnam, designated as a UNESCO World Heritage site in 2003? Which national park in the United States was designated as a UNESCO World Heritage site in 1978? What is the name of the famous canyon in the United States, designated as a UNESCO World Heritage site in 1979? The Galapagos Islands are a UNESCO natural World Heritage site located in which country? What is the name of the UNESCO natural World Heritage site located in the Himalayas? What is the name of the UNESCO natural World Heritage site in South Africa known for its diverse marine life? Which UNESCO natural World Heritage site in China is known for its giant panda sanctuaries? What is the name of the UNESCO natural World Heritage site in South Korea known for its volcanic islands?