A waterfall that flows continuously inwards, yet does not fill the basin beneath it.
A waterfall located in the midst of a larger body of water that pours continuously inwards — as if rushing over the lip of a suddenly submerged cup. Logic dictates that water flowing over the falls should fill the basin into which it flows. But through some means a void remains, and the falls continue to flow. The physics behind this phenomenon can be handwaved away with environmental magic, or the author can conjure up a high tech, super-efficient water recycling machine that somehow keeps the basin from flooding. The space at the center of these waterfalls seems to be coveted real estate, drawing all sorts of examples of Bizarrchitecture. Can be the mark of a not-quite-so-underwater Underwater City. Dramatically speaking, there's always the possibility that whatever machinery or magic drains the basin will break and the protagonists will be faced with a rapidly flooding arena. Whether or not they can swim is a different story. Sister trope to Waterfall into the Abyss, in which water cascades from a seemingly inexhaustible source off the side of a Floating Island or the edge of a Flat Land. Also related to Mega Maelstrom, which is mother nature's version of this but with spinning . Can lead to an Inevitable Waterfall moment, even in the middle of an ocean.
Examples:Anime & Manga
- During the Enies Lobby arc of One Piece, the main judicial building Robin is being held in is on Enies Lobby, an island hanging in the middle of an abyss by a narrow strip of land far too frail to actually support it. The abyss is in the middle of the ocean, which drains eternally into this bottomless pit.
- One of the unlockable friend areas in Pokémon Mystery Dungeon: Rescue Team is the "Enclosed Island," which houses Deoxys. It appears as a rocky outcropping in the center of a circular waterfall◊ with a single narrow path leading off screen.
Description: An eerie light encloses this rocky island, keeping out the sea. It is as if the island is in another dimension.
- In Adventures of the Gummi Bears episode My Gummi Lies Over the Ocean, bears Gruffi and Tummi are stranded on an island in the middle of a hole in the ocean, surrounded by falling water◊. Unlike other examples, the water is filling up the hole, threatening to sink the island; our heroes - and a third Gummi, Gusto, who was stranded years before - have to figure out how to get back home before it does.
- The lunar sea spire from Steven Universe episode "Cheeseburger Backpack" appeared as an intricately designed tower at the center of a circular waterfall somewhere in the Atlantic ocean. After centuries of neglect, the mechanism that keeps the water from closing in on the tower is about to fail. Pearl mentions that the moon goddess statue that belongs on the top floor is the only thing that can save the spire, but the Crystal Gems ultimately fail in replacing the statue in time and have to watch as the spire is swallowed by the waves.
- Bell-mouth spillways found in reservoirs around the world. When the water level is low, they look like inverted trumpet bells stick out of the water. When the water level is high, it looks like a hole's opened up in the surface of the water.
- The National 9/11 Memorial features two rectangular "reflecting pool" fountains. At the center of each pool is a small square waterfall, while the edges of the pools are much taller waterfalls that cascade inwards, The fountains are set in the footprint of the twin towers.
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