Tethys is the fifth largest satellite of Saturn and is similar in size to Dione. It is an icy world with a diversity of terrain. On the lower right-hand limb is a profile view of the giant impact basin Odysseus. Because Tethys was warmer when the impact occurred, the crater floor relaxed to the spherical shape of Tethys' surface, and the crater's rim and central peak collapsed. Towards the upper-right limb is a portion of the immense trench Ithaca Chasma.
The Voyager 2 spacecraft acquired this image on August 25, 1981 from a range of 680,000 kilometers (420,000 miles). It is a color composite made from two separate Voyager images taken through orange and violet filters.