NASA's Mars Global Surveyor shows the Olympica Fossae, a complex array of deep troughs, channels and streamlined landforms in northern Tharsis. Water, mud, and lava are all thought to have played a role in the formation of these features.

The Olympica Fossae are a complex array of deep troughs, channels and streamlined landforms in northern Tharsis. Water, mud, and lava are all thought to have played a role in the formation of these features. MOC image obtained on March 20, 1999.

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