Umbriel's most prominent Surface Features: Skynd and Wunda Craters (Natural Colors; credits: NASA)

The surface of Umbriel is an ancient one.

A collection of impact craters of various sizes was found to saturate the landscape. As Voyager 2 drew closer, became clear that most or all of the bright features are related to craters. On the Terminator, one can see 2 interesting craters.

One, Skynd, has a bright Central Peak. The other, Wunda, at the top of the image, has a bright rim and no apparent Central Peak. This is the best color image obtained by Voyager 2.