tidal island
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Encyclopedic overview
Diagram of tidal island at low tide and high tide St Michael's Mount, Cornwall, at high tide, c. 1900 Cramond Island, Scotland, at high tide: the causeway is submerged, but the anti-boat pylons are still visible
A tidal island is a raised area of land within a waterbody, which is connected to the larger mainland by a natural isthmus or man-made causeway that is exposed at low tide and submerged at high tide, causing the land to switch between being a promontory/peninsula and an island depending on tidal conditions.
Excerpted from Wikipedia’s “tidal island” article, available under the CC BY-SA 4.0 licence.