Interesting Surface Feature in Nilosyrtis Mensae (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia/Italian Planetary Foundation)

Nilosyrtis Mensae is an ancient Terrain with a wonderful variety of Landforms and Rock Types. And so: what is this Circular Landform? It probably got its shape from an Impact Crater long ago, but was subsequently eroded and filled in, and then eroded again, so that now it is something like a "Low Mesa", surrounded by a Boulder-rich Geological Unit.

Mars Local Time: 15:34 (Middle Afternoon)
Coord. (centered): 28,286° North Lat. and 75,424° East Long.
Spacecraft altitude: 287,8 Km (such as about 179,9 miles)
Original image scale range: 28,8 cm/pixel (with 1 x 1 binning) so objects ~ 86 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 8,5°
Sun-Mars-MRO (or "Phase") Angle: 50,4°
Solar Incidence Angle: 59° (meaning that the Sun was about 31° above the Local Horizon of the imaged Region, at the time that the picture was taken)
Solar Longitude: 180,1° (Northern Autumn - Southern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer Italia