Sastrugi, parallel ridges on the surface of hard snow, at the South Pole. The image is dramatically lit by a low sun from one side, colouring the shadows of the sastrugi in blue and showing their complex surface layers. Photo taken in October 2023 by Travis Goh for the National Science Foundation (NSF) and shared under a CC BY-NC-ND 4.0 licence: https://creativecommons.org/licenses/by-nc-nd/4.0/ Photo source: https://photolibrary.usap.gov/PhotoDetails.aspx?filename=2023Oct3-South-Pole-Sastrugi-Travis-Groh.jpg
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