The Hephaestus Fossae are a system of troughs and channels that are about 604 kilometers in length. The fossae have been tentatively identified as outflow channels, but their origin and evolution remain ambiguous.

ID: ESP_054906_2020
date: 13 April 2018
altitude: 286 km

https://uahirise.org/hipod/ESP_054906_2020
NASA/JPL-Caltech/University of Arizona
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