This is a Baobab tree. The genus is found throughout Africa, Madagascar, some parts of Asia and in Australia. They are often called "the tree of life". Their trunks often reach 7 to 11 m in diameter and the Glencoe baobab (usually considered the largest in existence) had a diameter of 15.9 m until it split into two parts a few years ago.
A single tree can hold up to 4,500 litres (1,189 gallons) of water.
From I f Love Science