This pair of ridges may have been the floor of a meandering river on Mars.

NASA / JPL / MSSS

The loop at the center of the picture appears to be the inverted form of a former meandering stream that was cut off as the channel adjusted its course. The floor of this cut-off meander likely became a ridge because it was more resistent to erosion than surrounding land.

NASA / JPL / Malin Space Science Systems

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