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Among the fish that swim along the various reefs are merpeople. These merpeople have built a towering example to their civilization, a city named Atlantica. You can see the castle, where King Triton and his many daughters live, as well as various servants and friends to the family. The King has been known to allow audiences on occaison. Beyond the castle, the city is mainly made up of houses and the like.
Beyond the city are areas of general sprawl, where fish loll about and the rumored hiding place of Ariel's various human world goods. Of course, you'll want to steer clear of the sea witch Ursula's lair...

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A huge and towering fortress makes up this world, with naught but a gloomy and pale night to brighten the grounds. The castle is the rumored home to the Beast and his various servants. Word of a girl has been heard recently, though.
The West Wing is where the Beast rests and prowls, usually. Try to avoid there, and stick to the Ballroom or East Wing if you don't want him to come and attack you tresspassers.

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As the name suggests, Deep Jungle is a large jungle. Almost anything you could possible find in a jungle is here, like various wildlife, waterholes, waterfalls, and massive trees.
Recently, travelers have started setting up camp around here. One main camp, home to an odd professor and his daughter, is attracting a fair amount of attention for their research on the gorillas.

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A small little group of islands, this small paradise sits in the middle of a cast ocean. Though it's mainly made of beaches, the few citizens of this island have more than a few treehouse-like structures up, and a few waterfalls. Children make up the world's inhabitants. Kids like Sora and Riku live here, enjoying their childhood home.

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Like several worlds, this world has a huge castle, though this one is white and topped with bright blue roofs. The sun is always shining warmly here!
The garden is a tourist favorite, where many come to practice combat and talk with friends.
The library is also open to visitors, where many books can be found. Pluto also happens to sleep there.
The throne room is one of the only rooms off limits, though. For what reason, I can't imagine, but people generally have to avoid the magically-sealed room.
If the castle is not to your liking, however, try the town! They're very friendly to visitors.

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A townworld that prides itself on the spooky and haunting, Halloween Town is a dark world with inhabitants that would make any sane grade schooler run for their life. Skeletons walk, ghosts parade, and zombies ponder about the meaning of life.
The moon is this world's sole source of light, and it does a good job of illuminating the dark and spindly buildings and graveyard.
While this place may identify with being spooky, scary is another thing entirely! Being outright mean is something generally frowned upon, despite what people like Oogie Boogie might say. Keep a sharp look out!

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Neverland is a truly impressive world, when compared to others. Neverland consists of two islands. One island is fairly modernized, with city sprawl throughout it and a landmark clock tower. The other is a realm where some children, given the oppurtunity to fly there, never grow up. This second island is the main attraction, with indians and mermaids, and the hide-out of one Peter Pan.
Keep an eye out for Captain Hook and his dastardly pirates, though. They don't think well of tresspassers on their ship.

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One of the most famous places in all of Greece, the Olympus Coliseum is a massive testament to the sheer amount of battle-hardened warriors the traverse the world. Champions and heroes of all ages and skills come here to test their worth against others in tournaments. Inbetween tournaments, trainer Philoctetes (call him Phil) usually lets potentials use the arena for practice.

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Despite consisting of an entire ocean, this world is known as Port Royal because the only place people can land Gummi Ships without notice is in the trading port of Port Royal.
Port Royal is home to a town, where blacksmiths, families, tavern runners, and the like operate under the dead of night. The Govenor's house is generally off limits though, you commoners!
An ocean away is the Isla de Muerte, or Island of Death. Isla de Muerta is a hard to reach island where pirates tend to stash away treasures for later use.
While on the high seas, keep a sharp look out for pirates... those fiendish scallywags tend to raid boats and steal everything you have on you! The worst of them is the Black Pearl, a legendary pirate ship known to have dark and foul sails and set any crew's high hopes to the bottom of a cliff.
A graveyard of ships lost to pirates is also in a some far off area, but people generally avoid that area... never know if pirates are lurking around out there...

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Welcome to the Pride Lands, a wide and expansive land with naught but the native animals to keep you company on the wide savannah plains.
You'll find the area less than green, lush, and happy though. Currently ruled by Scar, a mean and foul lion, the Pride Rock and surrounding Savannah aren't looking up to snuff. Dead grass sways in the wind, and few animals roam where such a prosperous land used to exist.
Keep in mind that you'll need magic to be able to change form and take on an appearance to match your surroundings.

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A massive city, and home to the largest population among the worlds. A town is what this world is, mainly, and many stores and inns can be seen from any street corner. Plazas populate the world generously, and green plant life is abundant.
In the center of it all is a towering bastion, home to Ansem the Wise and his pupils. There, Ansem keeps the world in tip-top shape using a computer mainframe that precious few have access to.

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Prepare yourself! In the Land of Dragons, you'll find a massive snowscape atop a fierce mountain, which leads down to the pride and joy of China, the Imperial City. Troops are among the many people that travel here, all serving the Emperor.

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A half-finished town, Traverse Town is still in the process of being built. Electrical wires, pipelines, and building frameworks are still able to be seen. There is debris everywhere, and you can constantly see the builders working away steadily under the constant night sky.

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Amid a rocky expanse and far off ocean is a large town that sits where the sun only just continues to shine on the horizon, leaving the aptly named Twilight Town to live in the sunset forever. A large market and wide open spaces, with small closed spaces too, make up a large part of this world. Railroads and an underground tunnel system, as well as a fair amount of woods, make this town one of the most different worlds there is.

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No one's really sure what exactly is up with this world... there's a steep tunnel, a house where you could be 5 feet tall or 5 inches tall, a forest with talking plants, a Queen of Hearts who enjoys beheading people, and a certain cat that could pop up anywhere, in any fashion.
This isn't called Wonderland for no reason. The unexpected is the norm here.