A tidal island is a raised area of land within a body of water, 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.
Because of the mystique surrounding tidal islands, many of them have been sites of religious worship, such as Mont-Saint-Michel with its Benedictine abbey. Tidal islands are also commonly the sites of fortresses because of the natural barrier created by the tidal channel.
List of tidal islands Asia Hong Kong Ma Shi Chau in Tai Po District, northeastern New Territories, within the Tolo Harbour Kiu Tau Island in Sai Kung
Iran Naaz islands in the Persian Gulf, southern seashore of Qeshm island
Japan Enoshima, in Sagami Bay, Kanagawa Prefecture
Taiwan Kueibishan in Penghu Jiangong Islet in Kinmen
South Korea Jindo Island and Modo Island in southwest South Korea Jebudo in the west
Europe Denmark Mandø Island – on Denmark's western coast Knudshoved Island – north of Vordingborg on southern Zealand, Denmark
Denmark/Germany The Halligen in the North Frisian Islands, Denmark/Germany
France
Île Aganton in Brittany Île Madame in Charente-Maritime Île de Noirmoutier in Vendée Mont Saint-Michel in Normandy Tombelaine in Normandy Grand Bé, Petit Bé and Fort National in Saint-Malo
Germany The Neuwerk in the Wadden Sea
Guernsey Lihou in Guernsey, one of the Channel Islands
Iceland Grótta in Seltjarnarnes, the Capital Region
Ireland Coney Island near Rosses Point, County Sligo Omey Island in Connemara, County Galway Inishkeel, County Donegal
Italy Isola Grande, Sicily
Jersey Elizabeth Castle in Jersey, a castle off the south coast accessible on foot at low tide Saint Aubin's Fort La Corbière Lighthouse La Motte, Jersey, alias Green Island L'Avarison, which hosts Seymour Tower Archirondel Tower, now connected via permanent causeway Icho Tower Portelet Tower
Spain Cortegada Island in Pontevedra coast, Galicia. San Nikolas Island in Lekeitio, Bizkaia
United Kingdom
England Asparagus Island, Mount's Bay, Cornwall Burgh Island, Devon Burrow Island, Portsmouth Harbour Chapel Island, Cumbria Chiswick Eyot in the River Thames in London Dova Haw, one of the Islands of Furness, off the coast of Cumbria Gugh in the Isles of Scilly (joined to St Agnes at low tide) Headin Haw, one of the Islands of Furness, off the coast of Cumbria Hilbre Island, Middle Eye and Little Eye in the River Dee estuary, between North Wales and the English Wirral, but administratively in England. Horsey Island, Essex Lindisfarne, Northumberland, also known as Holy Island Marsden Rock, South Tyneside, Tyne and Wear Mersea Island, Essex (accessible to road traffic via the Strood) Northey Island, Essex Osea Island, Essex Piel Island, Cumbria Scolt Head Island, Norfolk Sheep Island, Cumbria (joined at low tide to Piel Island and to Walney Island) St Mary's Island, North Tyneside St Michael's Mount, Cornwall White Island, Isles of Scilly and St Martin's, Isles of Scilly
Northern Ireland
Nendrum Monastery on Mahee Island, Strangford Lough Guns Island, near Ballyhornan Isle of Muck, Portmuck Rough Island, near Comber, Strangford Lough
Scotland Baleshare in the Outer Hebrides, joined to North Uist Bernera Island, joined to Lismore Brough of Birsay in Orkney, joined to Orkney Mainland Castle Stalker on Loch Laich in Argyll Cramond Island in the Firth of Forth Island Davaar near Campbeltown, off the Kintyre peninsula Eilean Arnoil in the Outer Hebrides, joined to the Isle of Lewis Eilean Donan in the western Highlands of Scotland Eilean Fladday and Eilean Tigh off the Isle of Raasay Eilean Shona in Loch Moidart, Lochaber, Highland Eilean Tioram, in Loch Moidart Erraid off the Isle of Mull Hestan Island near Rough Island in Auchencairn Bay Islands of Fleet: Ardwall Isle and Barlocco Isle in Galloway Isle Ristol, the innermost of the Summer Isles Kili Holm in Orkney, joined to Egilsay Oronsay in the Inner Hebrides, joined to Colonsay Oronsay in Loch Bracadale, joined to Skye Orosay in the Outer Hebrides, joined to Barra Rough Island opposite Rockcliffe, Dumfries & Galloway Uyea, Northmavine, off the Northmavine peninsula, Shetland Vallay (Bhàlaigh), joined to North Uist in the Outer Hebrides
Wales Burry Holms off the Gower Cribinau off Anglesey Gateholm off the south west coast of Pembrokeshire Ynys Llanddwyn off Anglesey Mumbles Lighthouse located in Mumbles, near Swansea St Catherine's Island in Pembrokeshire Sully Island in the Vale of Glamorgan Worm's Head at the end of the Gower Ynys Cantwr off Ramsey Island, Pembrokeshire Ynys Feurig off Anglesey Ynys Gifftan in Gwynedd Ynys Gwelltog off Ramsey Island, Pembrokeshire Ynys Lochtyn on the coast of Cardigan Bay
43 (unbridged) tidal islands can be walked to from the UK mainland.
North America Canada Bird Islet in Neck Point Park, Nanaimo, British Columbia Finisterre Island, off Bowen Island, British Columbia Francis Peninsula, off Sunshine Coast (British Columbia) Micou's Island in St. Margarets Bay, Nova Scotia Minister's Island, New Brunswick Ross Island and Cheney Island in Grand Manan, New Brunswick Wedge Island, Nova Scotia Whyte Islet in West Vancouver, British Columbia
United States
Bar Island in Maine Battery Point Light in California Bumpkin Island in Massachusetts Camano Island in Puget Sound of Washington state, since earth filled Charles Island, in Connecticut Douglas Island in Alaska High Island, New York Long Point Island, Harpswell, Maine Tskawahyah Island of Cape Alava, Washington
Oceania Australia The Point Walter Sandbar in Perth, Western Australia has slowly formed into a tidal island and is only connected to the mainland in extreme low tides. Penguin Island (Western Australia) in the Shoalwater Islands Marine Park Former tidal island Bennelong Island in Sydney, Australia was developed into Bennelong Point and is now the location of the Sydney Opera House.
New Zealand
Kōpuahingahinga Island, Pararekau Island and Te Toka-Tapu-a-Kupe / Ninepin Rock in Manukau Harbour Matakana Island in Tauranga Harbour Moturoa / Rabbit Island, Bells Island, and Bests Island in Tasman Bay The Okatakata Islands in Rangaunu Harbour Opahekeheke Island in the Kaipara Harbour Puddingstone Island in the Otago Harbour Taieri Island / Moturata in Otago Taitomo Island on the west coast of the Auckland Region The Hauraki Gulf islands of Motutapu Island and Rangitoto Island are connected at low tide
See also
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