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HiRISE 3D: Collapse Terrain near Orson Welles Crater
Between Orson Welles and Ganges Chasma is a region where materials subsided and collapsed over underground cavities that had once held aquifers.
Full image: https://www.uahirise.org/anaglyph/ESP_084545_1780_ESP_076699_1780_RED
NASA/JPL-Caltech/University of Arizona
@HiRISE kind of karst like, I reckon.