The latest image released from Mars Express reveals a large extinct volcano that has been battered and deformed over the aeons. By Earthly standards, Tharsis Tholus is a giant, towering 8 km above the surrounding terrain, with a base stretching over 155 x 125 km. Yet on Mars, it is just an average-sized volcano. What marks it out as unusual is its battered condition. Read more
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a suite of troughs in the Tharsis region that were also the site of some catastrophic floods. These features are located northwest of the volcano, Jovis Tholus.