There is a method to remove all Coastal Lowland tiles in the middle of a game if it crashes on the turn of Sea Rising, see here.You can still play on smaller region of the Giant or Largest Earth maps, just make sure it’s not larger than 'Enormous'.Remember to always send the crash report if asked for by the Firaxis Crash Reporter. I can’t do anything to fix that, so don’t ask me, ask the devs to restore pre-GS stability for larger maps.You will get random crashes and crashes on water level change in late game on Giant & Ludicrous size, even after lowering graphic settings.Since the Gathering Storm patch, the game doesn’t work with map sizes larger than 'Enormous'.
WARNING: MAP SIZES > ENORMOUS = LATE GAME CRASHES WITH GS PATCH