Aside from the main caldera, there are two other volcanic craters: the Olmoti and Empakai. The Olmoti is famed for its beautiful waterfalls, and the Empakai is known for its deep lake and lush green walls.
Another amazing site is the Olduvai Gorge, a 14km long ravine. In order to protect this incredible natural wonder, visitor numbers are closely monitored, and you must obtain a permit to enter the crater and the gorge.
The crater was formed around 2.5 million years ago when a volcano – thought to be roughly the same height as Kilimanjaro – erupted and collapsed in on itself. Now dormant, the volcano’s crater is 610 metres deep and 20km wide, making it the world’s largest inactive caldera.