Avatar: the Last Airbender - The Promise Locations

Ba Sing Se is the capital city of the Earth Kingdom and the strongest fortress in the world.

Earth Kingdom is one of the four great nations of the world and ruled by the Earth King.

Fire Nation is a chain of islands in the west of the World of Four Nations and practice firebending.

Fire Nation Capital is the capital city of the Fire Nation and home it the Imperial Palace.

World of the Four Nations is the home world to the lands of Earth, Fire, Wind, and Water.