"Coprates Chasma in the <a href=""http://astrogeology.usgs.gov/geology/mars-valles-marineris"">Valles Marineris</a> on Mars, photographed <a href=""http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Coprates_Chasma_and_Coprates_Catena"">by the Mars Express spacecraft</a>. Appearing in the top half of this image, it ranges from 60-100 km wide and drops 8-9 km below the surrounding plains."
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