There are several streamlined islands in this image of Kasei Valles. This image captured by NASA's 2001 Mars Odyssey spacecraft is located near the region where Kasei Valles empties into Chryse Planitia.
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).