"This world is our home. We have lived here since the beginning of life on earth."—Dr. Andrew Golsue, 3926.
The homeworld for humanity.
Post-Überschwemmung
Terrain
The earth is a desolate ocean planet.The entire planet is covered in water with only mount everests tip sticking out about 3 meters at low tide. Though even everest is doomed to one day be eroded down below the ocean.
Biology
On the whole of the world every terrestrial lifeform is wiped out, including humans. (not the ones that moved to Aldea or Hawthorne tho) Not only is terrestrial life now dead but so is all life that requires high saline contents. All the added water is fresh water so most saline dependent creatures would die, have to evolve to not need it or require a lower amount of saline.
Remaining on earth there is one singular sentient being left. A sentient robot that was abandoned on a military naval ship after killing a mother and her child, having mistaken the both for members of a terrorist group. This robot was named Machwell after being discovered by a teenager attempting to survive the floodening earth.
Countries
Naturally post-überschwemmung no countries remain standing.
Main story post-überschwemmung
The main story (on earth) after the überschwemmung revolves around Machwell as he learns to deal with no longer having a function, needing to reprogram himself and needing to make sure his ship stays afloat. Oh and the loneliness.