At Mars' North Pole is a dome of icy layers ranging up to 2 kilometers thick, roughly analogous to the Earth's ice caps in Greenland or Antarctica. This image is from NASA's Mars Reconnaissance Orbiter.
Eridania Basin, located at the head of Ma'adim Vallis, has mounting geomorphic and spectral evidence that it may have been the site of an ancient inland sea. This image is from NASA's Mars Reconnaissance Orbiter.
This pair of images covers one of many sites on Mars where researchers use the HiRISE camera on NASA's Mars Reconnaissance Orbiter to study changes in gullies on slopes. Changes are visible in deposits near the lower end of this gully.
On Mars, alluvial fans are sometimes visible in impact crater basins, as material from the steep rims is transported radially inward to the relatively flat floor. This image is from NASA's Mars Reconnaissance Orbiter.
This crater, seen NASA's Mars Reconnaissance Orbiter, is located in Meridiani Planum, about 20-kilometers northwest of where NASA's Opportunity rover landed in 2004 and about 42-kilometers northwest of Endeavour Crater's rim.
The largest crater associated with a March 2012 impact on Mars has many smaller craters around it, revealed in this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
These images from the Context Camera on NASA's Mars Reconnaissance Orbiter were taken before and after an apparent impact scar appeared in the area in March 2012. Comparing the images confirms that fresh craters appeared during the interval.
This April 6, 2014, image from NASA's Mars Reconnaissance Orbiter was taken as a follow-up to discovery of a possible 2012 impact scar in images from the orbiter's Mars Color Imager. It reveals two craters within the darkened area (center of rectangle).
Olympia Undae is a large field of sand dunes surrounding Mars' North Polar ice cap. High latitude covers them with water and carbon dioxide frost in the winter so they are illuminated. NASA's Mars Reconnaissance Orbiter views these best in summer.
In this Mars Reconnaissance Orbiter view of the Curiosity rover mission's waypoint called 'the Kimberley,' the red dot indicates the location of a sandstone target, 'Windjana,' selected for close-up inspection.