The Ngorongoro Conservation Area was originally part of the Serengeti National Park. After land disputes with the Masai tribes, it was separated into the conservation area and the Masai were forced to leave the Serengeti. The main feature of the conservation area is the Ngorongoro Crater which is the worlds largest unbroken, unflooded volcanic caldera. The Crater, which formed when a giant volcano exploded and collapsed on itself some two to three million years ago, is 2000 ft deep and the floor is 102 square miles. Estimates of the height of the original volcano range from fifteen to nineteen thousand feet high.