Tied island

View from the Isle of Portland looking towards the mainland of Great Britain. Chesil Beach on the left connects the tied island to the mainland

St Ninian's Isle, a tied island during all but the very highest tides

Tied islands, or land-tied islands as they are often known, are landforms consisting of an island that is connected to mainland or another island 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: Maury Island, Washington in the Puget Sound, Coronado, California and Nahant, Massachusetts in the U.S.; Barrenjoey, New South Wales in Australia; Howth Head in Ireland; Wedge Island in Western Australia; Cheung Chau in Hong Kong and Davaar Island, Campbeltown, Scotland.

The Isle of Portland is also described as a tied island, although geographers now believe that Chesil Beach (which connects the island to the mainland) is a barrier beach that has moved eastwards, rather than a tombolo, which would have been formed by the effect of the island on waves.

Paniquian Island (also known as Isla Boquete) is a tied island in Puerto Galera, a popular tourist destination in the Philippines. The island is connected to the main island of Mindoro by a small tombolo that is only submerged a few times per year.

References[]

Glossary of geology and related sciences. Jesse V. Howell, American Geological Institute. 1962.
Some Coastal Landform Definitions. Matthew Flinders, Villanova College, Queensland.

External links[]

Media related to Tied islands at Wikimedia Commons

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Tied island

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