Sand Dunes and Landslide in Valles Marineris. In this region, the walls have been modified by landslides.
Debris flows are numerous, as are jumbled masses of debris below the cliffs.
Wind may be an effective agent in removing debris that has slumped into the canyon. The canyon thus enlarges itself by the combined processes of slumping and wind excavation. The image is about 100 km across. North is to the top of the image.