This model is inspired from the "Mars ocean Hypothesis" which states that an Ocean may have been covering up to a third of the Martian globe in the past.
The texture and simulated "flooding" of areas, makes use of real NASA elevation data for accurate shoreline topography.
It can also be seen as a depiction of an in-between state in a Terraforming process as the planet warms up, and turns out that theories indicating that Mars's past water remains frozen inside the ground are correct.