The South Polar "sulci" of Enceladus

Caption NASA:"Enceladus appears as a rather bland orb in this far-off snapshot, but the dark markings near its South Pole belie that assumption.
The markings, called "sulci", are long, roughly parallel fractures from which a spray of icy particles escapes into the void, forming Saturn's E-Ring.
This view looks toward the Saturn-facing Hemisphere on Enceladus. North is up.

The image was taken with the Cassini spacecraft narrow-angle camera on May 27, 2007 using a spectral filter sensitive to wavelengths of infrared light centered at 930 nanometers.
The view was acquired at a distance of approx. 615.000 Km (such as about 382.000 miles) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 3°.
Image scale is roughly 4 Km (a little more than 2 miles) per pixel".