The Ngorongoro Crater is the largest unbroken caldera in the world.  Surrounded by very steep walls rising 610 metres from the crater floor, this natural amphitheatre measures 19.2 kilometres in diameter and 304²km in area.  It is home to up to 30,000 animals, almost half of which are wildebeest and zebra.  Buffalo, elephant, hippo, hyena, jackal, lion, ostrich, serval, warthog, bushbuck, eland, hartebeest, reedbuck, waterbuck and huge herds of both Thomson’s and Grant’s gazelle are easily seen on the crater floor.