Avatar: The Great Age of Peace
The Water Nation is in actuality two mighty kingdoms one located in the north pole, the other in the south. Since the time of Avatar Aang the southern water tribe has be come into prosperity to match their sister tribe in the north. Both cities are nearly self sufficient, the only majour difference being that the Southern Water Tribe is ruled by an elected council, while the Northern Water Tribe is ruled by hereditary leaders. In the year 200 ASC Construction finished on the massive city that was built in the south pole, which is twin to the city of the north pole. The southern Water tribe is now the home to Tui; the moon spirit, who simply appeared there one day in the year 270 ASC The Northern and Southern water Tribe hold a massive celebration each year known as the New Moon celebration, a key feature of this celebration is a ceremonial dance wherein the two tribes circle each other in a wild spiral that eventually coalesces into one large group. The tribes are sometimes referred to as the Twin Tribes of Tui and La.
Forming a separate offshoot of the water nation is a group of water benders that live in Froggy Swamp in the Earth Nation lands. This group remains quite separate from the other Water Nation populous, many not even recognising that they descended from the Water Tribe.