I'm wondering, are the new coastline based on scientific data, like topography or whatever? I should imagine that a lot more land would be submerged at sea-levels +100 feet, but please correct me if I am mistaken.
The world map looks pretty cool. The new political entities sure are interesting. Some of the island in the Asian Co-Prosperity League seem to have a weird border along their northern coasts, though.
The only thing I'd I would consider changing is maybe to give each nation their own color, to make them even more unique.