Tyrrhenna Patera is thought to be an ancient volcano. It is located in Hesperia Planum in the martian southern hemisphere. The Mars Orbiter Camera recently acquired this view of escarpments and valleys on the lower northeast flank of the volcano. Small, bright dunes cover low areas such as valley and crater floors. The picture is illuminated from the lower right and covers an area 3 kilometers (1.9 miles) across.
Image Credit: NASA/JPL-Caltech/MSSS
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