Volcanic flows cover the majority of the surface of Mars. In some regions, like around Arsia Mons, the flows are readily identifiable. As time passes, the flow features are covered or eroded away by other processes. This region of Tharsis near Olympus Mons contains subtle features showing its lava flow origin. Note the "softened" flow fronts and lava channels.
Photo credit: NASA/JPL/Arizona State University
Note: This location of this photo is just southeast of Olympus Mons and northwest of Gigas Sulci.
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