Mars channels     Image based on the Mars Global Surveyor/Mars Orbital Laser Altimeter data. No, this is not the huge Valle Marineris (Mariner Valley), but rather a smaller set of valleys to the north, made up of Kasei Valles, Lunae Mensa, Sacra Mensa, and Nilokeras Fossa, yet still over 1000 kilometers long. It's hard to imagine the bulk of these channels being formed by anything else other than water flow, though there might have been some final sculpting due to wind.

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