Steampunk Mars

This is what Mars may have looked like before the solar wind stripped its atmosphere when it was warm enough for water to exist as a liquid.

A series of delta - type structures all at the same height suggest that there was a water table near our even above the surface for most of the northern hemisphere.  Of the table was above the surface then a shallow ocean may have covered all the blue areas.

The lack of a detectable coastline suggests otherwise but there are ways that coastline might have been smoothed out,  such as tsunamis.

Anyway, this is a potential early Mars.

I feel a steampunk plot coming on.