Tied island

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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 Uk dor portharbour.JPG
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 of tides Tombolo St Ninians 5940.JPG
St Ninian's Isle, a tied island during all but the very highest of tides

Tied islands, or land-tied islands as they are often known, are landforms consisting of an island that is connected to the 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 since it was once an island but is now linked to the mainland.

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Other examples include Maury Island, Washington in the Puget Sound, Coronado, California, and Nahant, Massachusetts in the United States; Paraguana Peninsula in Venezuela; Barrenjoey, New South Wales and Wedge Island, Western Australia; Paratutae Island in New Zealand; Mount Hakodate in Japan, Howth Head in Ireland; Davaar Island, Campbeltown, Scotland; Chefoo island in Yantai, China; and Cheung Chau in Hong Kong.

The Isle of Portland, in England, is also described as a tied island, but 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 small 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, which is submerged only a few times per year.

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<span class="mw-page-title-main">Tombolo</span> Deposition landform in which an island is connected to the mainland by a sandy isthmus

A tombolo is a sandy or shingle isthmus. A tombolo, from the Italian tombolo, meaning 'pillow' or 'cushion', and sometimes translated incorrectly as ayre, is a deposition landform by which an island becomes attached to the mainland by a narrow piece of land such as a spit or bar. Once attached, the island is then known as a tied island.

<span class="mw-page-title-main">Chesil Beach</span> Shingle beach in Dorset, England

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<span class="mw-page-title-main">Shoal</span> Natural submerged sandbank that rises from a body of water to near the surface

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<span class="mw-page-title-main">Spit (landform)</span> Coastal bar or beach landform deposited by longshore drift

A spit or sandspit is a deposition bar or beach landform off coasts or lake shores. It develops in places where re-entrance occurs, such as at a cove's headlands, by the process of longshore drift by longshore currents. The drift occurs due to waves meeting the beach at an oblique angle, moving sediment down the beach in a zigzag pattern. This is complemented by longshore currents, which further transport sediment through the water alongside the beach. These currents are caused by the same waves that cause the drift.

<span class="mw-page-title-main">Mainland, Orkney</span> Main island of the Orkney Islands, Scotland

The Mainland, also known as Hrossey and Pomona, is the main island of Orkney, Scotland. Both of Orkney's burghs, Kirkwall and Stromness, lie on the island, which is also the heart of Orkney's ferry and air connections.

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<span class="mw-page-title-main">Skerry</span> A rocky island smaller than an islet

A skerry is a small rocky island, or islet, usually too small for human habitation. It may simply be a rocky reef. A skerry can also be called a low sea stack.

St Ninian's Isle is a small tied island connected by the largest tombolo in the UK to the south-western coast of the Mainland, Shetland, in Scotland. It is part of the civil parish of Dunrossness on the South Mainland. The tombolo, known locally as an ayre from the Old Norse for "gravel bank", is 500 metres long. During the summer the tombolo is above sea level and accessible to walkers. During winter, stronger wave action removes sand from the beach so that it is usually covered at high tide, and occasionally throughout the tidal cycle, until the sand is returned the following spring. Depending on the definition used, St. Ninian's is thus either an island, or a peninsula; it has an area of about 72 hectares.

<span class="mw-page-title-main">Storm beach</span>

A storm beach is a beach affected by particularly fierce waves, usually with a very long fetch. The resultant landform is often a very steep beach composed of rounded cobbles, shingle and occasionally sand. The stones usually have an obvious grading of pebbles, from large to small, with the larger diameter stones typically arrayed at the highest beach elevations. It may also contain many small parts of shipwrecked boats.

<span class="mw-page-title-main">Paraguaná Peninsula</span>

<span class="mw-page-title-main">South Walls</span> Island of the Orkney Islands, Scotland, UK

South Walls, often referred to as Walls, is an inhabited island adjacent to Hoy in Orkney, Scotland. The name is a corruption of "Sooth Was", which means the "southern voes" – as with Kirkwall, it was assumed that it was a mispronunciation of "walls".

<span class="mw-page-title-main">Ayre (landform)</span> Shingle beaches in Orkney and Shetland

An ayre is the name used for shingle beaches found in Orkney, Shetland, the Isle of Man, Lancashire, Cumbria and Northumbria. The word is derived from the Old Norse eyrr, meaning a shingle beach or gravelly place, and may be applied to ordinary beaches, cliff-foot beaches such as the Lang Ayre in Northmavine, Shetland, spits, bars or tombolos, but only if formed of shingle. More than 130 such shingle beaches are named on Ordnance Survey maps of Shetland, but far fewer in Orkney, where most beaches are formed of sand. The word in its Old Norse form is common in Iceland, and it also occurs in a few place names in the north and west of the Scottish mainland which had a strong Norse influence, such as Eriboll and in the names of several shingle banks—Salt Ayre, Green Ayre, Stake Ayre, Rabbit Ayre and Whinny Ayre—in the tidal reach of the River Lune at Lancaster.

<span class="mw-page-title-main">Los Morrillos (Cabo Rojo)</span> Cape and tombolo landform located in Puerto Rico

Los Morrillos de los Cabos Rojos or more commonly known as Los Morrillos de Cabo Rojo, is a cape and tombolo landform located in southwestern Puerto Rico in the municipality of Cabo Rojo. Los Morrillos is an excellent example of a tombolo, or a tied island, with two sand pits. The cape resembles a letter Y with its two promontories or morrillos being connected through sand pits which enclose a saltwater lagoon. The landform was designated a National Natural Landmark in 1980, and the site includes mangroves, beaches, important bird nesting areas, limestone caves, cliffs and rock formations. The reddish-colored limestone cliffs give the name to the town and municipality of Cabo Rojo.

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