NASA's Mars Global Surveyor shows trough formed of coalesced collapse pits in the Tractus Catena region of northern Tharsis, Mars.

4 December 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a trough formed of coalesced collapse pits in the Tractus Catena region of northern Tharsis, Mars.

Location near: 54.8°S, 0.7°W
Image width: width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Summer

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