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Fretted Terrain

The region Nilosyrtis Mensae is delineated fretted terrain, because of its numerous labyrinth-like valleys that often exhibit viscous flow features. Dissection by water and ice left rounded hills and mesas. Many landforms throughout the image have a softened appearance attributed to extensive degradation. The former impact crater to the right of the image was flattened and widened over time due to fluvial erosion and infilling with sediments, so that the crater relief nearly disappeared.