... features indicating liquid water in the past.
In the lower left part of the image, some small valleys can be spotted, leading into an ancient, nearly completely vanished impact crater (see annotated image), which indicate a past era of liquid water at the surface. In the upper central part of the image a strongly eroded impact crater also shows some little valleys leading into what remained from the crater. Below it, a crater approximately 18 km in diameter displays distinct alcoves and channels in the crater wall. The crater floor also shows a lobate filling, here in an apparently earlier stage.