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Anime and Manga
- In Daphne in the Brilliant Blue, the setting is a series of connected cities on water due to a cataclysmic event that flooded the world.
- Ghost in the Shell:
- Ghost in the Shell: Man-Machine Interface (the manga) features Poseidon Industrial's artificial island city, where Motoko Aramaki's real body is typically stored.
- The second film has an android manufacturer that bases its factory on a ship because they're dubbing the ghosts of young girls into their robots.
- The conclusion of the Enies Lobby arc in One Piece shows turning the City of Canals Water Seven into this is mayor and shipwright Iceburg's next big project.
- Neo Venezia in ARIA, naturally, since it's a replica of Venice.
- The Psycho-Pass movie is set to take place primarily on a floating city owned by a Southeast Asian government in the Pacific called Shamballa.
- The Asterisk War: Rikka, the series' main setting, is an artificial island-city based on a crater-lake in North Kanto.
- Magic: The Gathering: In Ixalan, the closest thing the closest the pirates of the Brazen Coalition have to a capital is the city of High and Dry, a collection of derelict ships lashed together and kept afloat. It originally grew around two ships that became hopelessly entangled after ramming into each other, with more and more ships being added over time until it became a full-sized settlement. It usually floats off of Ixalan's northeastern coast, and serves as neutral "ground" for the pirates to meet, unwind and strike deals with each other.
- Plan 7 of 9 from Outer Space. Gneelix proudly shows off holographs of his past adventures. One shows construction workers proudly standing on the deck of a newly completed mid-Atlantic seadrome. The next image shows the same group fleeing in terror as the floating airport is swamped by a vast rogue wave.
- In Waterworld, since all known land has been covered by water most people live in "atolls" made from scrap metal. As well as traders who live on boats and the "smokers" who are based on the Exxon Valdez.
- In Star Wars, the populace of the water-world Mon Calamari live in giant floating cities. One half is above water for the Mon Cals and air-breathing visitors, one half underwater and flooded for the Quarren.
- San Angel from The Book of Life sits in the middle of a lake.
- David Brin's novel Existence has artificial islands popping up as sea levels rise. However most of them are resorts for the super-rich or havens for questionably legal biotech experiments. China has a "shoresteading" program for desperate people to try and make the upper levels of flooded mansions in what used to be Shanghai liveable.
- Gordon R. Dickson's Home From the Shore
- Neal Stephenson's Snow Crash has "Rife's Raft", a gigantic, cobbled-together collection of floating garbage in the Pacific Ocean inhabited by huge numbers of refugees, mostly from Asia.
- David Drake's The Lord of the Isles series includes a vignette in the first book in which Sharina, Nonus, and some useless nobles spend a few days on the Houseboats of the Sea People. They spend their entire lives at sea and live in large structures crafted largely from whale.
- Nineteen Eighty-Four repeatedly mentions military installations called "floating fortresses" that are apparently under construction, which dwarf the ordinary battleships that were their inspiration — but never explains what they are. Considering the setting, they may not even exist.
- In Raiders of Gor we meet the Caste of Rencers, who live in a delta connecting a great river and the sea, gathering rencenote for trade. They live in small villages built on floating rafts of rence. As the rence rots away underwater they weave new layers on top.
- The Skeezers in Glinda of Oz live in a city suspended over the middle of a lake. In times of danger they can magically submerge the entire city for protection, turning it into an Underwater City.
- The pirate city of Armada in The Scar takes this trope Up to Eleven, being built of thousands of ships, large and small, of every conceivable design roped together en masse.
- Saturns Race takes place on an island grown from accreted sea chemicals ('seament').
- Thule from Arctic Rising is a collection of ships and oil platforms attached to the last few bits of Arctic sea ice. Later, several of them decide to go their own way.
- In Mikhail Akhmanov's Arrivals from the Dark, between the second the third novels (roughly a 150-year gap), a new nation has sprung up on Earth called the Pacific Aquatoria, made up of privately-owned floating islands. Sergey Valdez, the protagonist of the third novel, is from one such island, owned by the Valdez family, but mortgaged to the bank due to the high costs of living at sea.
- In The Hobbit, Esgaroth, or Lake-Town, is built on a series of wooden platforms in the middle of the Long Lake, ostensibly as protection from the local fire-breathing dragon.
- In Magic 2.0, the Sunken City of Atlantis is a gleaming reflective bowl that stands on pillars in the Mediterranean. It's explained that "sunken" does not mean Underwater City in this case but more of an architectural style, like in a "sunken apartment". The outer shell of the city is pure solid diamond created on a molecular level with a macro (similar to a Matter Replicator but with programming code). Inside, the city has buildings all over the sloping walls with one-way windows through the "floor". Floating Platforms (also diamond) provide transportation across the city. Plumbing is handled by teleporting waste into orbit, resulting in a lot of shooting stars. The city is ruled by a triumvirate: the President (the sole elected post), Brit the Elder (the builder of the city), and Brit the Younger (Brit the Elder's younger self). Atlantis is a haven for female time travelers and the largest time traveler colony, as most of history wasn't very kind to women with magic.
- The Arc Of A Scythe features the Island of the Enduring Heart, also known as Endura. It functions as headquarters for the World Scythe Council, a historical attraction for tourists, and a refuge for the family members of Scythes. Scythe Goddard sinks it at the end of the second book.
- Pandemic Legacy Season 2: You operating from a number of floating "havens".
- Classic Traveller supplement The Traveller Adventure. The planet Heguz is an Ocean Planet. It has had two colonies, both set up on large floating bases. Both colonies mysteriously disappeared without a trace.
- Shadowrun: Proteus Corp built a number of "arkoblocks" (floating arcologies) off the coast of Japan.
- One of the Mystara modules for Basic/Expert/etc Dungeons & Dragons features a floating city built on giant wooden platforms, kept above water by an enchanted idol that makes everything linked to it unsinkable.
- Sid Meierís Alpha Centauri:
- A major gameplay element, as any faction can create sea based settlements as well as the standard land based ones, in contrast to the Civilization series where only land based cities are permitted. The Nautilus Pirates faction starts the game with such a settlement and can create an ocean empire faster than the others.
- The Rising Tide expansion pack for its Spiritual Successor, Civilization: Beyond Earth, also allows players to build cities on ocean tiles. Ocean cities work very differently to land-based cities, with increased production rates for naval units and certain buildings, while facing other challenges, such as Kraken attacks and obstructive Hydra-coral growths. A new Sponsor, the very British/Scandinavian-flavoured North Sea Alliance, gives a number of bonuses to oceanic cities. According to the fluff, the founder of NSA is famous for pioneering the concept back on Earth with the so-called ARCs, one of which he personally piloted to an island nation in danger of flooding and handed it over to the locals, earning himself international fame. Aquatic cities are unable to expand borders by accumulating culture (buying hexes with cash still works) but can build a recurring project that moves the city one hex upon completion, which expands borders. There is even an achievement for crushing an enemy unit with a city (difficult to do, since everyone can see the warning "arrow" coming from the city towards a particular tile). This way, aquatic cities can act as mobile bases for an invasion and an impromptu aircraft carrier.
- Frequent in Real-Time Strategy games that involve naval combat (most Command & Conquer titles, for example): The ship-building structures are constructed directly at sea.
- Then there's the Black Tortoise from Command & Conquer: Red Alert 3, a huge floating fortress. Its also possible to make base in water, certain structures such as refinery's, power plants, and airbase can be built on water.
- Brink is set aboard The Ark, an experimental floating colony designed to be completely self sufficient.
- The Mechanical Age in Myst once was this, according to Atrus' account. The city, surrounded by three tall hills, sank when pirates destroyed its foundations, but he installed a fortress on top of it for the survivors to fight back with.
- Knights of the Old Republic has the planet of Manaan with the native water-breathing Selkath, which is covered entirely with water except for Ahto City, which is built on the surface of the ocean to accommodate visitors.
- In Final Fantasy X, during the Shoopuf ride you learn about the city built over the ocean, which was built just because it could be. Needless to say, it got destroyed by Sin and sank to the bottom.
- Resident Evil: Revelations: Terragrigia
- Syndicate (2012) has the city of La Ballena, which is owned by the Caymen Global syndicate.
- Tears to Tiara 2 has Tartetos, an Advanced Ancient Acropolis that combines aspects of Atlantis and Tenochtitlan.
- S.S.D.D has the Britannia, a massive ship built on an iceberg that England's wealthy fled to when the Anarchists took over.
- In The Kenny Chronicles Tarnekis, genetically engineered human-animal hybrids are largely forced to live on converted cruise ships. The sequel series, Ferrets vs. Lemmings takes place on an artificial island.
- In Homestuck, there are a number of these (although we only see the one) in the future of Alpha Timeline Earth after the Condesce floods the planet, where Roxy and the timeline's Exile population live. Unlike the shiny high-tech version of this trope you usually see in science fiction, these are ugly blocks of prefab housing stated to be basically floating slums, since the well-being of her subjects isn't terribly high on the Condesce's list of priorities.
- In Schlock Mercenary the capital of the United Nations of Sol is Dom Atlantis, a megalopolis of some 4 billion situated in the North Atlantic.
- In Cadillacs and Dinosaurs, the Remains of New York became a floating city called The City In the Sea.
- Avatar: The Last Airbender: In the first season, the Fire Nation has a Tailor-Made Prison for earthbenders: a giant offshore platform built entirely out of metal (metalbending wouldn't be discovered for another season). One of the reasons The Movie is so reviled is that it replaces the platform with a quarry, making the earthbenders' plight less "nothing to help us escape" and more "we can't be bothered to escape". The Legend of Korra has a similar situation with Ghazan's prison, out at sea and made entirely of wood (Ghazan isn't a metalbender, but they're known to exist by then) and without a speck of dirt anywhere. As we find out during his escape, Ghazan is a lavabender, and just having a few pebbles on hand is enough for him to create a buzzsaw out of lava.
- The Marvelous Misadventures of Flapjack has Stormalong Harbor, a rickety island made of wooden planks and piles driven into the seafloor. The harbor is divided into "Upper" (where the rich live) and "Lower" (where the rest live) Stormalong. Despite being basically a huge harbor people live on, it has a functional plumbing system along with a trolley and enough support to hold up entire manors for the rich (the richest man in Stormalong has a massive one with a lawn, gardens, and fountains).
- Certain groups such as The Seasteading Institute and Project Blueseed intend to do this in real life.
- The unrecognized micronation Sealand is based on one of the Maunsell Sea Forts built during WWII.
- Frequently seen in nations with sea access and not enough space for new buildings (Japan, Singapore, etc.) as well as countries with an influx of wealthy tourists and investors (Dubai, Bahrain...). In fact, several airports (such as Kansai International in Osaka) have been built in harbors by using landfill (as in, the kind made from rocks and dirt, not the kind made from garbage) to create artificial islands big enough to operate major airports on. One major challenge in designing these airports is that the weight of the airport itself (buildings, planes, equipment, and of course miles of thick paved runway surfaces) causes the island to sink further into the water.
- Venice, although it's not in open sea, is probably the best known example we have today.
- Tenochtitlan, capital city of the Aztec civilization, was mostly built of "floating gardens" constructed around islands in a large lake. What is left of the city is located in the middle of modern-day Mexico City.