This is an image of the surface of Mars.
Click on image for full size
NASA
Planet Structure
The uniquely red global surface of Mars is marked by many interesting
features - some like those on the Earth and others
strangely different. The reddish color is caused by rust
(iron oxide) in the soil.
Some of these features are; volcanoes, canyon systems, river beds, cratered
terrain, and dune fields.
Of these features, the most interesting includes the
apparently dead volcano Olympus Mons, which rises 23 km (~75,000 ft)
above the surrounding plains and is the highest known peak in the
Solar System. Valles Marineris is a giant canyon system that runs
about 2,500 miles across the surface of the planet and reaches depths
of 6 km or 4 miles (for comparison, the Grand Canyon is not more
than 1 mile deep).
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