HiRISE 3D: A Question of Thermokarst
Thermokarst is a type of terrain characterized by very irregular surfaces of marshy hollows and small hummocks formed as ice-rich permafrost thaws.
https://www.uahirise.org/anaglyph/ESP_040837_1405_ESP_032872_1405_RED
NASA/JPL-Caltech/UArizona