Harmakhis Vallis is an approximately 800-kilometer long outflow channel located in eastern Hellas. The valley probably formed by a combination of surface collapse and flowing water.

The edges of Harmakhis Vallis were enlarged by material slumping off the walls, and it was later filled with ice-rich material, similar to glaciers on Earth. This image shows part of the valley floor that filled with glacial ice. Can you see the parallel ridges on some of the glaciers that show how the ice flowed downhill, around and between obstacles?

ID: ESP_075639_1420
date: 15 September 2022
altitude: 258 km

https://uahirise.org/hipod/ESP_075639_1420
NASA/JPL-Caltech/University of Arizona
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