Nirgal Vallis is one of the largest and longest valley networks on Mars, approximately 400 kilometers in length. Although Nirgal formed long ago, likely by flowing water, abundant wind-blown sediments transformed into the dune fields that now line the valley floors.

ID: ESP_076145_1520
date: 24 October 2022
altitude: 253 km

https://uahirise.org/hipod/ESP_076145_1520
NASA/JPL-Caltech/University of Arizona
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