Atlantica
Ariel, a princess of Atlantica, yearned to go to other worlds. But her dream could not be realized as King Triton, her father, forbade such notions.
Ursula took advantage of this to coax Ariel into leading her to Triton's trident, which she the seized for herself.
To atone for her mistake, Ariel went to Ursula's lair with Sora, Donald and Goofy to retrieve the trident.
After her morays were defeated, Ursula used the trident's power to become a giant, but was vanquished in the end. With the trident's power, Sora found the keyhole and sealed it.
