A former island is a mass of land that was once an island, but has been joined to a mainland, another island, or engulfed by a body of water. The process of joining might be the result of volcanic activity, moving tidal sands, or through land reclamation. Islands engulfed by the sea may have lowered because of subsidence, tectonic activity, erosion, or rising sea levels. For example, the New Moor island in Bangladesh existed in the 1970s, but was engulfed by the Bay of Bengal in 2011.
Examples
Eldøyane, a partially artificial former island in Norway
Any of several former Islands in the River Thames, England
Sevan Island, a former island in Armenia, now a peninsula
Urk, a former island now part of the reclaimed Noordoostpolder in the Netherlands, a victim of the Zuiderzee Works, a land fill designed by Cornelis Lely Sakurajima, a former island now joined to the mainland in Japan Mount Muria, now part of Java
See also
Ghost Island (disambiguation) List of lost lands Phantom island
Further reading
Johnson, H & Kuwahara, S (2016), " Sakurajima: Maintaining an island essence", Shima: The International Journal of Research into Island Cultures, vol. 10, no.1, pp. 48–66.