gwen: Surface of Mars, photographed by Mars Express, 22nd August 2007.
Image runs southwest from 71°S 56°E, just south of the Dorsa Brevia, to 80°S 34°E, just west of the Promethei Rupes; about 615 km. The dunes (dark blue) in the 4th image are inside Main Crater (Robert Main, astronomer, 1808-1878).
Composite of 3 visible light images for colour, and one monochrome image for detail. Colours are relative, not naturalistic.