Tethys

Tethys is the smallest of the six large moons of Saturn and it is also an icy world. Its surface has two distinct features. One is the crater Odysseus, which has a diameter of 400 km, two fifths of the size of the moon itself. The other striking feature is the Ithaca Chasma, which is a chasm 2 000 km long, up to 100 km wide and up to 5 km deep. Like Dione, Tethys shares its orbit with two smaller Trojan moons.