Tethys (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)

Caption NASA:"The Cassini Spacecraft looks toward an area between the Trailing Hemisphere and anti-Saturn side of Tethys and spies the large crater Melanthius near the moon's South Pole and, in this picture, near the Terminator.
Melanthius is about 250 Km (approx. 155 miles) wide on Tethys. North on Tethys is up and rotated 19° to the right.

The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on April 29, 2010. The view was acquired at a distance of approx. 670.000 Km (such as about 416.000 miles) from Tethys and at a Sun-Tethys-Spacecraft, or Phase, Angle of 41°.
Image scale is roughly 4 Km (approx. 2,5 miles) per pixel".