The Ngorongoro Crater is a conservation area and a UNESCO World Heritage Site. The crater itself stretches 19 km (11.8 miles) across and is 600 meters (1,968 ft) deep. It is the world’s largest unspoiled, dry volcanic caldera. The Ngorongoro crater acts as a protective enclosure for over 25,000 of large animals, including black rhinoceros, hippos, wildebeest, zebras, elands and gazelles – all of which live on the large crater floor. The Ngorongoro conservation area attracts many tourists that come to see the wildlife in its natural habitat.