<p><a href="http://travel.nationalgeographic.com/travel/national-parks/grand-canyon-national-park/">Grand Canyon</a>, meet your match—and then some. Mars's Valles Marineris (shown in a false-color composite picture released October 22 by the German Aerospace Centre) is the largest canyon system in the solar system. </p><p> Stretching across the equatorial Martian highlands for some 2,485 miles (4,000 kilometers), Valles Marineris yawns 124 miles (200 kilometers) wide and up to 6.8 miles (11 kilometers) deep. Earth's 1.25-mile-deep (2-kilometer-deep) Grand Canyon could easily fit into one of Valles Marineris's smaller side valleys. </p><p> Another measure of the Martian canyon's magnitude: It took 20 images from the <a href="http://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10364/">High Resolution Stereo Camera (HRSC) </a>aboard ESA's Mars Express spacecraft to represent Valles Marineris in glorious false color (as pictured above).</p>