This is the location with the most impressive known gully activity in the Northern Hemisphere. Gullies are active in the winter due to carbon dioxide frost, but northern winters are shorter and warmer than southern winters, so there is less frost and less gully activity.

An enhanced-color image cutout shows recent gullies with bright colors.

ID: ESP_049083_2320
date: 15 January 2017
altitude: 307 km

https://uahirise.org/hipod/ESP_049083_2320
NASA/JPL-Caltech/University of Arizona
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