Located in Solis Planum, this unusual volcanic flow has margins darker than the surroundings. It appears that the flow originated in the linear fracture or vent that bisects the flow deposit.
Photo credit: NASA/JPL/Arizona State University
Note: Solis Planum is a high-elevation volcanic plain located south of Valles Marineris. This particular location is south of the southeastern tip of Noctis Labyrinthus.