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. In all games, the boss of Atlantica is Ursula (occasionally accompanied by Flotsam and Jetsam).
King Triton is the ruler of this world, and its Keyhole is hidden in Ariel's grotto.
Settings and Areas
Atlantica has been the most drastically changing world throughout the Kingdom Hearts games. In each game in which it appears, its gameplay is completely different. In Kingdom Hearts, Ariel joins Sora as a party member and things carry out much like in any other world, with the exception that the controls are different to fit Sora's new form. He is also restricted from using special attacks such as Ars Arcanum and summons. In Kingdom Hearts: Chain of Memories, Sora doesn't change form at all, and the world is treated just like all other worlds. In Kingdom Hearts II, possibly the biggest change is seen; only two areas can be accessed, and the story progresses through completion of mini-games, rather than through battling enemies.
Atlantica has a sprawling design that requires certain special abilities to navigate successfully. Sora and company arrive in the Tranquil Grotto (安らぎの淵, Yasuragi no Fuchi?, lit. "Peaceful Abyss"), a small alcove-like area that is generally calm. From there, the party travels forward, to the Undersea Valley (アトランティカ, Atorantika?, lit. "Atlantica"), an enormous valley under the sea with numerous alcoves, high-rising rocks and a current throttling upwards. One exit leads to the Calm Depths (大海のよどみ, Taikai no Yodomi?, lit. "Stagnant Ocean"), which hosts a strong current that impedes Sora and company, unless they have the help of the Dolphin or the Mermaid Kick ability. Following the trident marks leads to a second part of the area which boasts another current of its own. Making it past the area leads to the Undersea Cave (海底洞穴, Kaitei Horaana?, lit. "Seabed Cave"), a small dark area that boasts a few alcoves but is overall unremarkable.
Going higher up, the party reaches the Undersea Gorge (海底峡谷, Kaitei Kyōkoku?, lit. "Seabed Canyon"), a vast area which, similar to the Undersea Valley, also boasts alcoves, a few podium-like rocks with clam shells on them and numerous exits to other areas in Atlantica. One of these is Ariel's Grotto (アリエルのかくれが, Arieru no Kakurega?, lit. "Ariel's Hideout"), a small room with shelves, stacked with knick-knacks and "thing-a-ma-bobs." Along the left side of the Undersea Gorge is a passage to the Undersea Garden (海底庭園, Kaitei Teien?, lit. "Seabed Garden"), a small room with a chaise-like rock and a lone clam shell. A third path is to Triton's Palace (トリトンの宮前, Toriton no Miyamae?), a large, colorful area full of different clam shells, a large, hollow conch shell and a long pathway to the Throne Room (トリトン王の間, Toriton-ō no Ma?, lit. "King Triton's Chamber"), an elegant round room where King Triton resides, which features a save point. Along the right from the Undersea Gorge, close to Ariel's Grotto, is a large sunken Treasure Chest that is also an exit to the Sunken Ship (難破船, Nanbasen?, lit. "Shipwreck"), a shipwreck site with a large ship in the middle.
After getting into the Sunken Ship area, Sebastian helps the party find a hidden door in the corner which leads to the creepy and dangerous Den of Tides (潮の魔窟, Shio no Makutsu?), with numerous geysers and stalactites that hang from the ceiling. A fork in the path leads to the Cavern Nook (潮の岩屋, Shio no Iwaya?, lit. "Grotto of Tides") on the right, a small room with a save point and a clam shell, and the Tidal Abyss (潮の深淵, Shio no Shin'en?) on the left, a path filled with sea polyps. Past that, Ursula's Lair (アースラの岩窟, Āsura no Gankutsu?, lit. "Ursula's Rock Cave") awaits, a round room with a large conch shell at one end where Ursula resides, a cauldron in the middle of the room, and a vanity to the right where the sea witch spends most of her time. By using Mermaid Kick from the Calm Depths, Sora and the party can reach the very end to reach the entrance to the Open Ocean, a large, dark area where their final encounter with Ursula takes place.
Kingdom Hearts II
Atlantica is much smaller in comparison to its Kingdom Hearts appearance, with only two areas available for Sora and the party to freely explore. They arrive and interact with the denizens of Atlantica in the Undersea Courtyard (海底広場, Kaiten Hiroba?, lit. "Seabed Square"), a moderately sized and colorful room, filled with clam shells and undersea flora. Along the way is Triton's Throne (トリトン王の間, Toriton-ō no Ma?, lit. "King Triton's Chamber"), similar to the first game, a round room with Triton's throne in the middle and a save point. Numerous areas appear but only in cutscenes and the minigame, these include: Ariel's Grotto (アリエルの隠れ家, Arieru no Kakurega?, lit. "Ariel's Hideout"), identical to the first game, The Shore (海岸, Kaigan?), an area over the surface with a vibrant blue sky with Eric's castle in view, and the Wedding Ship (客船, Kyakusen?, lit. "Cruise Ship"), an elegantly crafted ship with purple drapery and wedding decorations. Ursula is fought once more on the surface of the open ocean that is raging in a storm, in an area known as Wrath of the Sea (渦巻く海, Uzumaku Umi?, lit. "Swirling Sea").
Sora, Donald and Goofy arrive in Atlantica, with Donald using magic to alter their forms into those of undersea folk. They are soon encountered by Ariel, Flounder, and Sebastian, who help them get used to swimming about, despite Sebastian and Flounder's misgivings about the group. After Sora and company fend off a Heartless attack, Ariel asks them to accompany her and her friends to the palace, where they meet King Triton. Triton dispatches more Heartless with his trident and scolds Ariel for venturing outside the palace, and when Goofy mentions the group's search for the Keyhole, he angrily denies its existence. Ariel retreats to her grotto, accompanied by Sora and company. Triton and Sebastian briefly discuss the Heartless, and Sebastian reports that they seem to be coming from Ursula's lair.
In the grotto, Ariel tells the others about her interest in the surface world, and she proposes they search for the Keyhole. Followed from a distance by Sebastian, they explore the Sunken Ship, where they find a Crystal Trident resembling an indentation in Ariel's grotto, and they head back, fighting past the Shark on the way. At the grotto, Sora places the crystal into the indentation, but Triton arrives and, furious at Ariel's disobedience and upon seeing the crystal, destroys it. Crushed, Ariel leaves the grotto, and Triton confronts Sora about being from another world, declaring the Keyblade and its bearer as bringing ruin to worlds, and he tells him to leave the kingdom.
Meanwhile, Ariel is approached by Ursula, who promises to help her reach other worlds in exchange for her letting Ursula into the palace, so that she can find the Keyhole. Once inside, she steals Triton's trident and overpowers him; however, the Keyhole is not in the palace, and Ursula flees when Sora, Donald, and Goofy arrive. Triton asks the three to go after her and retrieve the trident, and Ariel and Sebastian accompany them in pursuit of Ursula. Near the Sunken Ship, Sebastian opens the path to Ursula's lair. The group confronts Ursula and her minions, Flotsam and Jetsam, in the lair, and they defeat them in battle, destroying the two eels in the process. Ursula retreats into the open ocean, where she uses the trident to grow to a tremendous size. Sora and company follow, and after a drawn-out battle, they finally triumph over her.
They retrieve the trident and return it to Triton, who apologizes for driving Ariel to helping Ursula and reveals that the crystal that was destroyed would have revealed the Keyhole in Ariel's grotto. He lends Ariel his trident so she can reveal the Keyhole and requests that Sora seal it. After it is sealed, Sora apologizes to Ariel for not telling her about being from another world, but she forgives him, expressing her wish to visit other worlds herself someday.
Kingdom Hearts: Chain of Memories
In Castle Oblivion, Sora, Donald, and Goofy use one of the World Cards to enter a fascimile of Atlantica based on their memories. They encounter Ariel, who has stolen Triton's trident from the palace. After speaking with Sebastian at the palace, they follow Ariel to her grotto and discover that Ursula has promised to reunite her with Flounder, who Ursula claims is trapped in the human world. Sora and the others agree to accompany Ariel to confront Ursula and discover the truth about what happened to Flounder.
When they arrive at Ursula's lair, however, Ursula reveals that she captured Flounder herself and demands the trident in exchange for his freedom. Ariel reluctantly turns it over to her, and although she releases Flounder as promised, she uses the trident to grow to giant size and attacks. Sora successfully defeats her, however, and Ariel recovers the trident, deciding to tell the truth when she returns it to her father.
Later, Riku also enters a memory-based Atlantica in one of Casle Oblivion's basements, but he only encounters Ursula, who he defeats in battle.
Kingdom Hearts II
One night after a storm, Ariel swims up to the surface and finds Prince Eric, floating unconscious on a piece of wreckage, and brings him to shore. Infatuated by him, she sings to him, but disappears into the sea when he begins to stir, leaving him to wonder about the girl who saved him.
Once Sora, Donald and Goofy arrive back in Atlantica, they reunite with Ariel, Sebastian and Flounder, who help Sora refresh his swimming skills. Sebastian tells the group about the concert he is planning and asks them to participate, in order to preoccupy Ariel and cheer her up. After Sora and the others learns the basics, they all perform a song together. King Triton comes by, and he tells Sora he hopes rehearsing for the concert will take Ariel's mind off the human world. When Ariel is still unable to focus on rehearsals, however, Flounder suggests they give her a statue of Eric that had sunk from his wrecked ship.
They bring the statue to Ariel's grotto, to her delight. She sings about her fascination with life on the surface, and Sora promises to help her. In the meantime, Sebastian writes a new song, which celebrates life under the sea, and challenges Sora to learn it. They perform the new song, but Ariel tells Sebastian she wants to sing about harmony between the surface and the world beneath, much to his dismay. Ariel threatens not to participate in the musical and storms off, and Sebastian laments that she has fallen in love with a human, which Triton overhears. On the surface, Ariel brings Sora and the others to the beach, where Eric has been looking for the girl who saved him. They see Eric lose a pendant in the surf, and it lodges under some rocks.
Ariel is excited when they retrieve the pendant, planning to return it to Eric. However, Triton confronts her, and despite her attempts to reason with him, he destroys Eric's statue. Ariel flees, devastated, and she is approached by Ursula, who offers to turn her into a human for three days in exchange for Ariel's voice. If Ariel can get Eric to kiss her before the three days are up, she will remain human; otherwise, she will return to her mermaid form and belong to Ursula. Sora and the others arrive too late to prevent Ariel from signing Ursula's contract, and they are unable to stop Ursula's magic. They help the now-human Ariel to the surface, and she is found on the beach by Eric. Although she is unable to speak, she returns his pendant, and he takes her into his home.
Over the next few days, Sebastian and Flounder keep an eye on Ariel, while Sora and the others try to find Ursula, to no avail. On the night of the second day, Ariel and Eric nearly kiss, but Flotsam and Jetsam interfere. On the last day, with still no sign of Ursula, Sora, Donald, and Goofy return to the beach to see Ariel in tears and Eric walking with a black-haired girl, who sings in Ariel's voice. Flounder recognizes the girl's necklace as belonging to Ursula and concludes that she is Ursula in disguise. Sora uses a beam of light from the Keyblade to knock away and destroy the necklace, restoring Ariel's voice and freeing Eric from Ursula's influence. Eric realizes that Ariel is the girl who saved him, but the sun is already setting, and Ursula, back in her true form, takes Ariel back to the sea, with Sora and company in pursuit.
Back underwater, Triton confronts Ursula and offers himself in Ariel's place, putting his name on Ariel's contract. Ursula transforms Triton into a polyp and takes his trident. She threatens Triton, but Eric, who followed Ariel underwater, grazes her arm with a harpoon. Enraged, Ursula sends Flotsam and Jetsam after him and uses the trident to grow to giant size. During the ensuing battle, Sora manages to destroy the two eels, then knocks the trident from Ursula's hand. Eric throws the trident, piercing Ursula and destroying her. After the battle, Ariel sadly shows Eric her mermaid form, but Eric reaffirms his love, and they embrace.
Later, while Ariel and Eric continue seeing each other, with Triton's support, Sebastian continues planning the musical. In order to make it the best ever, he asks Sora for his help with an idea he has. In the end, the concert features a song celebrating Ariel and Eric's love and peace between above and below the surface. After the concert, Sora opens a Gate with the Keyblade, but before they leave, Sora, Donald, and Goofy sing a goodbye song, saying that they will meet again.
Some time after the defeat of Xemnas, Ariel has become fully human, and she and Eric are on their wedding cruise, waving to King Triton, Sebastian, and Flounder.
Atlantica is unique in that Sora takes on a different form while in the world, courtesy of Donald Duck's magic. While in Atlantica, he is transformed into a "dolphin merboy", while Donald himself becomes a half-duck half-octopus creature, and Goofy a sea turtle. While in the Castle Oblivion version of Atlantica, however, Sora's party does not disguise themselves, and even remark on being able to breathe and walk despite ostensibly being underwater.
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