This image from NASA's Mars Reconnaissance Orbiter shows a roundish crater with three channels breaching the rim and extending to the south. The crater has been filled by sediments and may have been an ancient lake.
<p>When the water began to overtop the crater rim, it would rapidly erode a channel and, at least, partially drain the lake.
</p><p>Be sure to look at the <a rel="nofollow" class="external text" href="https://hirise-pds.lpl.arizona.edu/PDS/EXTRAS/ANAGLYPH/ESP/ORB_053700_053799/ESP_053736_2180_ESP_053670_2180/ESP_053736_2180_ESP_053670_2180_RED.browse.png">stereo anaglyph</a>.
</p><p>The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel. [The original image scale is 60.3 centimeters (23.7 inches) per pixel (with 2 x 2 binning); objects on the order of 181 centimeters (71.3 inches) across are resolved.] North is up.
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The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace &amp; Technologies Corp., Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.
NASA/JPL-Caltech/Univ. of Arizona
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