Atlantis is an underwater city in Chima. The tribes consist of Piranha, Squid, and Lobsters. They also have Water Chi. Atlantis is the main setting in the Atlantis story arc.
- Posideum: The king of Atlantis.
- Percy: Posideum's son and the prince.
- Pyon: A fierce piranha warrior.
- Pierra: A female piranha warrior.
- Squidbeak: The leader of the Squids.
- Squilox: A large squid warrior.
- Sqallie: Squidbeak's older daughter.
- Squella: Squidbeak's younger daughter.
- Baroxx: A barracuda, he is a warrior and guardian of the Water Chi
- Raxia: A ray, he is a scientist researching Water Chi
- Hector: A Hammerhead shark who is a ship builder, he hates Pirates
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