Hills in Acidalia Planitia (CTX Frame - Enhanced and Darkened Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)

The hilly landscape visible in this observation may appear at first rather bleak, due to the pervasive soils of uniform brightness blanketing most of the area.
However, upon closer examination, the image reveals rocky outcrops at the top of some of the hills.

These rocks contain clues pointing to a watery past.