Valles Marineris

Largest canyon system on Mars and in the Solar System. Some suspect plate tectonics played a role in its creation.

Recent Tectonics Possible (Jan 2011)

 * See Olympus Mons, Tharsis Montes, Valles Marineris


 * http://www.space.com/9683-surface-mars-possibly-shaped-plate-tectonics.html