Tied island in the context of "Isle of Portland"

A tombolo is a sandy or shingle isthmus. It 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. The word tombolo is from the Italian tombolo, meaning 'pillow' or 'cushion', and sometimes translated incorrectly as ayre (an ayre is a shingle beach of any kind).

Several islands tied together by bars which rise above the water level are called a tombolo cluster. Two or more tombolos may form an enclosure (called a lagoon) that can eventually fill with sediment.

The North Jutlandic Island (Danish: Nørrejyske Ø), Vendsyssel-Thy, or Jutland north of the Limfjord (Jylland nord for Limfjorden) is the northernmost part of continental Denmark and of Jutland. It is more common to refer to the three traditional districts of Vendsyssel, Hanherred, and Thy. The area has been intermittently a tied island and, during modern times, was not surrounded by water until a storm in February 1825, which severed the region from the remainder of Jutland and created a water connection between the North Sea and the western end of the Limfjord. Vendsyssel-Thy retains its traditional status as a part of Jutland even though it is now an island.

By area, it is the second-largest island of Denmark after Zealand (excluding Greenland), with a population of 294,424 on 1 January 2020. 309,834 people lived on the island in 1981.

Monemvasia (Greek: Μονεμβασιά, Μονεμβασία, or Μονεμβάσια) is a town and municipality in Laconia, Greece. The town is located in mainland Greece on a tied island off the east coast of the Peloponnese, surrounded by the Myrtoan Sea. Monemvasia is connected to the rest of the mainland by a tombolo (sandy isthmus) 400 metres (1,300 ft) in length.

In 1890, a small part of the natural tombolo was cut to create an artificial bridge for ships and boats. Its area consists mostly of a large plateau some 100 m (330 ft) above sea level, up to 300 m (980 ft) wide and 1 kilometre (0.62 mi) long.

12°00′N 70°00′W / 12.000°N 70.000°W / 12.000; -70.000

Paraguaná (Spanish pronunciation: [paɾaɣwaˈna]) is a peninsula and tied island in Venezuela, situated in the north of Falcón State, and comprises the municipalities of Carirubana, Los Taques and Falcón. The island of Aruba lies 27 km (17 miles) to the north. Bonaire and Curaçao are slightly further away. Paraguaná lies in the Caribbean Sea, and is connected to the rest of the state by the natural isthmus or tombolo of Médanos.

Gatas, or more commonly Isla de Gatas, is a small island in barrio Playa in the municipality of Ponce in southern Puerto Rico. A tied island since the 1950s connected to the Puerto Rico mainland via a tombolo, Isla de Gatas is home to Club Náutico de Ponce, a private sports complex. It is located south of La Guancha and the Port of Ponce. Together with Caja de Muertos, Morrillito, Ratones, Cardona, Isla del Frio, and Isla de Jueyes, Gatas is one of seven islands in the municipality of Ponce.

Kapıdağ Peninsula (Turkish: Kapıdağ Yarımadası) is a tied island in northwestern Anatolia extending into the Sea of Marmara in Balıkesir Province, Turkey. The peninsula forms the Gulf of Bandırma on its east and the Gulf of Erdek on its west.

Kapıdağ was the classical island of ancient Greek Arctonnesus, but was joined to the mainland by a narrow isthmus in historic times either by an earthquake or (according to legend) by Alexander the Great. It was also known as the Peninsula of Cyzicus after its chief town.

Barrenjoey is a locality in the suburb of Palm Beach, at the most northern tip of Pittwater. The headland is made up primarily of sandstones of the Newport Formation, the top third is a cap of Hawkesbury sandstone. Around 10,000 years ago the headland was cut off from the mainland due to the rising sea level; subsequent buildup of a sand spit or tombolo reconnected the island to the mainland (a 'tied island'). It is the location of the Barrenjoey Head Lighthouse, a lighthouse that was first lit in 1881. In 1995 Barrenjoey was gazetted into Ku-ring-gai Chase National Park.