The Great A'Tuin

Great A'Tuin, the World Turtle, of the species Chelys galactica, is the gigantic turtle upon whose back the Discworld was carried through space. The Disc does not rest directly on A'Tuin; instead, it rests on the shoulders of four immense elephants, Berilia, Tubul, Great T'Phon and Jerakeen, who stand atop the turtle's shell.