And always have been
https://en.m.wikipedia.org/wiki/List_of_lost_lands
Although the existence of lost continents in the above sense is mythical (aside from Zealandia), there were many places on Earth that were once dry land but submerged after the
ice agearound 10,000 BCE due to rising sea levels, and possibly were the basis for
neolithic and
bronze age flood myths. Some others were lost due to
coastal erosion or volcanic eruptions. Approximately listed by size, these are:
- Dvārakā, mythical city of Krishna, claimed by some to be found in marine archeology in the Gulf of Khambhat
- Sundaland, the now submerged Sunda Shelf.
- Kerguelen Plateau, a submerged micro-continent which is now 1–2 km below sea level.
- Beringia, connecting Asia and North America.
- Doggerland, the bed of the North Sea, which once connected Great Britain to Continental Europe before being inundated by rising sea levels during the Holocene.
- A large island in the Mediterranean Sea, of which Malta is the only part not now submerged.
- Maui Nui, once a large island of the Hawaiiarchipelago; several major islands represent residual high ground of Maui Nui.
- New Moore Island, an island in the Bay of Bengal submerged in 2010 by rising sea levels.
- Verdronken Land van Reimerswaal, most of this region in The Netherlands vanished in a storm in 1532; the town of Reimerswaal survived as an island into the 17th century; the last bits of land vanished in the early 19th century.
- Strand, an island off the German coast with the town Rungholt, eroded away by storm surges before being washed away by a final flood in 1634.
- Jomsborg and Vineta, legendary cities on the south coast of the Baltic Sea supposed to have been submerged in the Middle Ages.
- Jordsand, once an island off the Danish coast, eroded away by storm surges before being washed away by a final flood between 1998 and 1999.
- Ferdinandea, submerged volcanic island which has appeared at least four times in the past.
- Sarah Ann Island, now submerged guano island, located just north of the equator. Vanished between 1917 and 1932.
- Ravenser Odd, a large 13th-century town on an old sandbank promontory in East Yorkshire, which became an island and then vanished in January 1392.
- Dunwich, the traditional capital of the Kingdom of the East Angles that was lost to the sea by gradual coast erosion and partly by a storm surge in 1286.
- Dadu Island, which was legally the southernmost point of the United States of America, located at Palmyra Atoll and still shown on the map (an incorporated U.S. territory), was a bare sand islet washed away by a storm in 2014.
