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Sea Sinkhole

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Where does all that water even go? note 
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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.

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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 World. 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:

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     Anime & Manga 

     Video Games 
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     Western Animation 
  • In Adventures of the Gummi Bears episode My Gummi Lies Over the Ocean, 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.
  • Steven Universe: The Lunar Sea Spire from "Cheeseburger Backpack" appeared as an intricately designed tower at the center of a watery sinkhole somewhere in the Northwest Atlantic ocean, glowing with an unnatural light that underscored the mystical nature of the structure. As the episode begins it is revealed that centuries of neglect have taken their toll on the structure, and the mechanism that has kept the waters from closing in on the tower is about to fail. Pearl mentions that the "moon goddess" statue that was taken from the top floor of the spire is the only thing that can reverse the damage and save the spire from destruction... but the Crystal Gems are ultimately unable to return the statue to the spire, and must beat a hasty retreat as the sea sinkhole closes up and the structure is swallowed by the waves.

     Real Life 
  • 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 recessed rectangular "reflecting pool" fountains set in the footprints of the Twin Towers. At the center of each pool is a smaller square waterfall that seems to disappear underground. The edges of the larger pools themselves are are much taller waterfalls that cascade inwards.

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