Mars topographical map. Threedimensional composite satellite image of the surface of Mars. Topographical features are labelled in black. North is at top. Features visible include the Chryse Planitia (centre right), a plain with a diameter of around 840 kilometres, and Olympus Mons (centre left), the tallest known volcano and mountain in our solar system. The map was created using data from the Mars Global Surveyor spacecrafts Mars Orbiter Laser Altimeter.