Tied islands, or land-tied islands as they are often known, are landforms consisting of an island that is connected to land only by a tombolo: a spit of beach materials connected to land at both ends. St. Ninian's Isle, in the Shetland Islands off the north coast of Scotland is an example of this; it was once an island but is now linked to the mainland. Other examples include: North Island, San Diego, California, Barrenjoey, New South Wales in Australia and Wedge Island in Western Australia.
The Isle of Portland is also referred to as a tied island, although technically, geographers now believe that Chesil Beach which connects it to the mainland is a barrier beach which has moved eastwards, rather than a tombolo, which would be formed by the effect of the island on waves.
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