The worlds largest unbroken caldera in the world, the Ngorongoro Crater is 16-19 km in diameter, has a crater floor of 26,400 ha and a rim soaring to 400-610 m above the floor itself. The formation of the crater is associated with the massive rifting which occurred to the west of the Rift Valley. It also has a population of about 25,000 large animals living in the crater, which makes game driving a true highlight!