Aeolis Mensae yardangs, as seen by HiRISE. Scale bar is 500 meters long. Click on image for better view of yardangs.
Aeolis Mensae is tableland feature in the Aeolis quadrangle of Mars. Its location is centered at 2.9° south latitude and 219.6° west longitude. It is 820 kilometres (510 mi) long and was named after a classical albedo feature name.
Inverted relief 
Some places on Mars show inverted relief, in which a stream bed may be a raised feature, instead of a valley. The inversion may be caused by the deposition of large rocks or by cementation. In either case erosion lowered the surrounding land, but left the old channel as a raised ridge because the stream bed is more resistant to erosion. An image taken by HiRISE shows a ridge that may be old channels that have become inverted.
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