A landmass (usually an island) that is always on the move, making it difficult to find. Because of this, it's thought to not exist by most people, until one of the main characters finds it.
See also The Little Shop That Wasn't There Yesterday
. Supertrope of Floating Continent
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Anime and Manga
- The Shimaru homeland in Futaba-kun Change!, which floats around because it is really a crashed spaceship that let the moss grow on the hull a bit over the years
- in Tower of God TOG the forest wherein walkhaiksong HQ is located can be transported as Urek Mazino's Space Compression power. Multiple shineuh (heavenly god fish which look like space whales are speculated to be this trope. The sea cow on the 21st floor was able to contain Urek for long enough a time for him to be deemed a problem on the floor. Since TOG is such an expansive universe it's been said that there could be islands like this.
- Professor Semo's island base in the Mexican Fantômas comic book series.
- Marvel Comics has Krakoa, The Island that Walks Like a Man!!! And to a certain extent Spragg, the Living Hill.
- Justice League International: Kooey Kooey Kooey isn't always on the move, but sometimes it decides to wander for a bit.
- The Doom Patrol is allies with Danny the Street, a sentient talking mobile transvestite street, able to move from city to city, including at one point getting the team into the "city-like" base underneath the Pentagon.
Folklore and Mythology
- Greek myth gives us the floating island of Delos, birthplace of Apollo and Artemis.
- Quofum, a planet in the Humanx Commonwealth universe, has an annoying habit of not being there when one goes to look for it. It turns out that the entire planet is some kind of dimension-hopping starship.
- In The Witches of Karres, the titular planet is one of these. The residents like it that way.
- The residents control where it goes.
- The 51st state of Ar, or Hoqhoq as they prefer to be known, according to John Hodgman. It's inhabited by shapeshifting thunderbirds.
- The island of Leshp from Discworld which is a giant pumice dome that gets filled up with gas, rises to the surface, floats around a bit, then sinks again every couple of hundred years after causing a war or two.
- Seastar Island from The Voyages of Doctor Dolittle. Explained as a freak volcanic bubble during island formation creating a huge air pocket to serve as a float. When the rock at the top of the volcano drops down it punches a hole in the bottom to fix the island in place.
- The Island from LOST is constantly moving, thanks to a strange pocket of mystical energy.
- Mirage Island from Pokémon Ruby and Sapphire/Emerald.
- The island in Tales of Legendia, although it turned out to be an alien spaceship.
- The "Chocobo's Air Garden" in Final Fantasy IX will hover over 1 of 6 random locations on the world map. Once you've been there, it's current location can be found on the player's map, but before that it's identifiable by the circular shadow on the ground beneath it (hard to spot if it's over water). Getting there the first time requires the player to dig up all 6 pieces of the map to the island (which is really just a series of clues to the locations it might be found) by playing the Chocobo Treasure Hunt Mini-game and leveling up the Chocobo's abilities so that it is able to fly AND the use of a Dead Pepper every time the player wants to return to the Garden.
- The Air Garden gets you access to last couple Chocobo treasure maps, the optional super-tough side boss Ozma (but not the ability to HIT it with attacks, that's a whole other side quest), and the most difficult but most rewarding area to play the treasure hunt minigame (helpful if one is trying to pick up some of the semi-unique rewards).
- Though most remember Angel Island from the Sonic the Hedgehog series, the original Japanese manuals say that the (sea-bound) island of the first game also moved around.
- Candied Island in The Marvelous Misadventures of Flapjack.
- A Saturday morning cartoon called Noah's Island; a polar bear called Noah travels around the world on a floating volcanic island, picking up lost, ostracised and endangered animals and trying to get them to live in harmony. The Animals of Farthing Wood meets Noah's Ark on a mobile island!
- Also noteworthy as rare example of this trope that can be steered to a limited extent, using a sort of Bamboo Technology thruster system powered by the huge pool of molten lava in the centre of the island, which was left by the meteor that's responsible for it breaking off from a larger landmass in the manner of an iceberg. Well, it makes about as much sense as the rest of the show's premise.
- Truth in Television: Continental drift. It's just so slow only geologists notice.
- The island of San Serriffe, from a famous April Fools' Day hoax.
- Icebergs. Sometimes used as temporary islands.
- Astrophysicists now suspect that there may be stray planets wandering around in interstellar space, which were pulled out of their orbits when another star passed near their own.
- Terry Pratchett's Leshp (above) may be based in part on the Roundworld island of Ferdinandea, an island near Sicily that rises above sea level after periodic volcanic eruptions, only to disappear again after it is sufficiently eroded. When it made its most recent appearance in 1831, it was claimed as territory by four nations (The United Kingdom, France, pre-Italian-unification Naples, and Spain).
- Strange-things magazine Fortean Times (FT 297, February 2013) has an article about the strange case of the Pacific atoll Sandy Island, nominally halfway between Australia and Frence Caledonia. It has appeared on maps since the middle 1800's, and its existence was confirmed to the extent that it appears on Royal Navy sea-charts. It also appears in the Times Atlas of the World and even Google online maps list it. Its ownership is not disputed - it belongs in perpetuity to France as an overseas dependency. The only problem is - it has disappeared. An Australian Navy surveying ship reported nearly 5,000 feet of sea where the island was reported to be. Puzzlement has been expressed.