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Nirgal Vallis
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Nirgal Vallis gullies on Mars Perspective view of Nirgal Vallis, based on observations made by the Mars Global Surveyor. The sides of the canyon display features similar to runoff channels, and thus may indicate the presence of surface water in Mars's past. topographic map of Mars
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Photos

Nirgal Vallis gullies on Mars
Perspective view of Nirgal Vallis, based on observations made by the Mars Global Surveyor. The sides of the canyon display features similar to runoff channels, and thus may indicate the presence of surface water in Mars's past.
topographic map of Mars
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