The first view takes your breath away. Ngorongoro is a huge caldera formed after the collapse of volcano, 250 square kilometers and 23 kilometers wide. The crater has an average depth of 600 meters. Its spectacular setting and abundance of wildlife combine to make it a wonder of the natural world. Animals are free to leave or enter the crater but most of them stay because of the plentiful water and food available on the crater floor throughout the year.