This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows dark sand dunes in Arkhangelsky Crater, named for A. D. Arkhangelsky (1879-1940), an influential, early Russian geologist. The steepest slopes on these dunes, their slip faces, point toward the northeast (upper right), indicating formative winds from the southwest.
Location near: 41.3Â°S, 25.0Â°W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Autumn