The Ancient Plains of Rhea

Caption NASA:"Densely cratered plains cover the ancient surface of Saturn's moon Rhea. Following the Voyager Spacecraft encounters with Saturn, cryovolcanism was suggested as a source for the wispy markings on both Rhea and Dione.
Cassini has shown that Rhea's bright streaks are, like those on Dione, tectonic features and planetary scientists now think it is unlikely that cryovolcanic activity has ever occurred on this moon.
This view looks toward the Trailing Hemisphere of Rhea (1528 Km, or about 949 miles across). North is up.

The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on April 4, 2008. The view was acquired at a distance of approx. 1,2 MKM (such as about 735.000 miles) from Rhea and at a Sun-Rhea-Spacecraft, or Phase, angle of 39°.
Image scale is roughly 7 Km (about 4 miles) per pixel".