“Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep.
By comparison, the Earth’s Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep.”
Source (https://www.nasa.gov/multimedia/imagegallery/image_feature_83.html)
Via (https://reddit.com/r/spaceporn/comments/k0mkoy/_/gdjgqw9)
danelabonte 