The Mare Serpentis region (Latin for Sea of the Snakes) is located northwest of the giant Hellas impact basin and was named after the constellation Serpens in the northern celestial hemisphere. The observation shows impact craters of different ages, randomly distributed on the surface. The younger craters in the image show more distinct crater rims, the older ones appear much more smoothed and eroded. Especially peculiar are the different interior fillings of the craters. The surface patterns in these craters reflect the climatic conditions in which the fillings were formed, providing an insight into the history of the Martian climate.