NASA's Mars Global Surveyor shows a fluid-scoured surface in the Hrad Vallis system, located northwest of Elysium Mons on Mars. The fluid is presumed to have been water.

Image shows a fluid-scoured surface in the Hrad Vallis system, located northwest of Elysium Mons. The fluid is presumed to have been water. Image obtained by MOC on July 20, 1998.

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