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Sapping valleys

On the southern part (left side in the color image), sit 2 large and one smaller crater, the latter about 20 km in diameter, on a relatively undisturbed looking surface. The largest crater shows some fractures at its floor that could result from quick cooling of extruded lava after the impact. In the region between the impact craters and the chasm, two 2 km broad valleys can be spotted. These valleys, especially the upper one, show similarities to sapping valleys that are created by groundwater seepage. They may represent a further stage in the expansion of the chaotic terrain.