1011 meters

More at 100 gigameters

Venus

This is a false-color mapping of the surface of Venus. The Magellan spacecraft spent four years mapping Venus using an imaging radar technique. Brown represents mountains, while blue represents valleys.

This is an image from the Russian Venera 13 lander which parachuted to the surface of Venus on March 1, 1982. The lander is visible in the lower right of the picture.

Mars

This picture of Mars was taken by the Viking spacecraft.

This is a recent Hubble Telescope image of Mars.

This is one of the many images taken by the Viking lander.

This image from the Viking orbiter shows the Grand Canyon of Mars, which dwarfs its namesake on Earth.