This image from NASA's Mars Global Surveyor shows the floor and walls of a small portion of Nirgal Vallis on Mars. The floor is covered by large windblown ripples.

9 January 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows the floor and walls of a small portion of Nirgal Vallis. The floor is covered by large windblown ripples. The valley wall near the center right exhibits a group of gullies, formed perhaps by a combination of mass movement and possibly seepage and runoff of groundwater.

Location near: 28.2°S, 42.2°W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Summer

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