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From Wikipedia: http://en.wikipedia.org/wiki/Ngorongoro_Conservation_Area
The Ngorongoro Conservation Area (NCA) is a conservation area and a UNESCO World Heritage Site located 180 km (110 mi) west of Arusha in the Crater Highlands area of Tanzania. Ngorongoro Crater, a large volcanic caldera within the area, is recognized by one private organization as one of the seven natural wonders of Africa.
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