Atlantica

Atlantica is the homeworld to Ariel, King Triton, Eric, Sebastian, Flounder, Grimsby, Ursula, Morgana, Undertow, Evil Manta, and Saleen. Almost completely underwater, Atlantica is a rocky world with immense holes on its surface. Beneath the surface is an entire world full of fish, merfolk, and other aquatic species that make up King Triton's underwater kingdom. The Heartless that appear in Atlantica are unique to it, such as Sea Neons which resemble jellyfish. Its Keyhole is hidden in Ariel's grotto.