Tethys, from Voyager 2

Caption NASA originale:"Voyager 2 obtained this view of Saturn's moon Tethys on Aug.25 from a distance of 540.000 Km. It shows the numerous impact craters and fault valleys of a very ancient surface. Tethys itself is 1.090 km. (approx. 675 mi) in diameter and the great chasm seen at the top of this image extends about 1.700 Km (approx. 1.050 mi) halfway across the satellite. The largest impact crater visible here is 90 Km (approx. 55 mi) in diameter".