Planet Earth
Leader King Arthur
Capital Poseidonis

A kingdom whose underwater capital Poseidonis claims rule over two thirds of the Earth, Atlantis could be a major power in world politics (it has a seat on the UN Security Council and is known to exercise its veto over oceanic policies) but the undersea empire has a somewhat isolationist bent. King Arthur, known to the world as the former superhero Aquaman, seems to want to avoid the surface world as wherever possible and his heir apparent Prince Garth shows no sign of changing that approach. For now, Atlantis is a sleeping giant that the world must remember is mighty if roused.