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Olympus Mons

This huge shield-shaped volcano has grown from successive eruptions, the most recent around 30 million years ago.

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Ares Vallis

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After a seven-month journey, in 1997 the Mars Pathfinder landed in the Ares Vallis, a region that was flooded by water in the planefs eariy history.

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A 3-in- (10-cm-) wide trench : dug by the Phoenix lander craft in 2008 revealed ice under Mars’s surface soil.

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Echus Chasma

Formed by water cutting through -yj young surface rock, Echus Chasma * Jy" >■ is around 62 miles (100 km) long    t / .

and 6.2 miles (10 km) wide.    '*

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Mars 28|29