This image from NASA's 2001 Mars Odyssey spacecraft shows a small region between Olympus Mons and Sulci Gordii. There are lava flows, tectonic depressions and channels visible in the image. All the features are related to the volcanism.
Several channels are located on the flank of Hecates Tholus. In this image captured by NASA's 2001 Mars Odyssey spacecraft, one of those channels enters a crater, creating a deposit on the floor of the crater.
This image from NASA's 2001 Mars Odyssey spacecraft, located southwest of Olympus Mons, contains a very subtle windstreak in the bottom 1/3 of the image. Originating at a small crater, the windstreak records a wind that blew east to west.
Towards the top of this image from NASA's 2001 Mars Odyssey spacecraft is a 'T' shaped depression and two sections of narrow channel located on the northeast part of the Elysium Mons volcanic complex. Fluids (like water, or lava) flow downhill.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows a portion of the huge dune field located at the north polar cap. As spring continues to deepen, the dunes are becoming darker and darker as they lose their winter frost cover.
The dark markings in this image from NASA's 2001 Mars Odyssey spacecraft are tracks made by the passage of 'dust devils.' Dust devils are common in the extensive plains of the northern latitudes. This image is located in Utopia Planitia.