The channel system in the upper half of the image is Maja Valles, which averages 10 kilometers wide, 1 kilometer deep, and extends for about 180 kilometers. The channels appear to have been carved by flowing water released from Juventae Chasma (2°S,61°W), a 250 × 100-kilometer chaotic depression that is located several hundred kilometers to the south. The channel system in the lower half of the image is Vedra Valles. Both channel systems start in and cut into the old cratered surface of Lunae Planum and discharge into the younger plains of Chryse Planitia, shown on the right side of the image. The area shown is 225 kilometers across.
From Mars Digital Image map, image processing by Walter Kiefer, Lunar and Planetary Institute