Water-Carved?
The Reull Vallis, seen here in perspective view, could have been carved by water long ago, scientists speculate. It is east of the Hellas basin at 41° South and 101° East. The area is 100 km across.
Mars Scars
An area south of Valles Marineris at 15° South and 323° East and about 50 km across shows a tectonically controlled karst-like structure in a vertical view.
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