Tidal island

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A tidal island is a raised area of land within a waterbody, 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.

• Ma Shi Chau in Tai Po District, northeastern New Territories, within the Tolo Harbour
• Kiu Tau Island in Sai Kung

• Naaz islands in the Persian Gulf, southern seashore of Qeshm island

• Enoshima, in Sagami Bay, Kanagawa Prefecture

• Kueibishan in Penghu
• Jiangong Islet in Kinmen

• Jindo Island and Modo Island in southwest South Korea
• Jebudo in the west

• Mandø Island – on Denmark's western coast
• Knudshoved Island – north of Vordingborg on southern Zealand, Denmark

• The Halligen in the North Frisian Islands, Denmark/Germany

• 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

• The Neuwerk in the Wadden Sea

• Lihou in Guernsey, one of the Channel Islands

Grótta in Seltjarnarnes, the Capital Region

• Coney Island near Rosses Point, County Sligo
• Omey Island in Connemara, County Galway
• Inishkeel, County Donegal

• Isola Grande, Sicily

• 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

• Cortegada Island in Pontevedra coast, Galicia.
• San Nikolas Island in Lekeitio, Bizkaia

• Asparagus Island, Mount's Bay, Cornwall
• Burgh Island, Devon
• Burrow Island, Portsmouth Harbour
• Chapel Island, Cumbria
• Chiswick Eyot in the River Thames in London
• Gugh in the Isles of Scilly (joined to St Agnes at low tide)
• 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
• 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

• Nendrum Monastery on Mahee Island, Strangford Lough
• Guns Island, near Ballyhornan
• Isle of Muck, Portmuck

• 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
• Vallay (Bhàlaigh), joined to North Uist in the Outer Hebrides

• 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.^[1]

• Bird Islet in Neck Point Park, Nanaimo, British Columbia, Canada
• Finisterre Island off of Bowen Island, British Columbia, Canada
• Francis Peninsula off of Sunshine Coast (British Columbia), British Columbia, Canada
• Micou's Island in St. Margarets Bay, Nova Scotia, Canada
• Minister's Island in New Brunswick, Canada
• Ross Island and Cheney Island in Grand Manan, New Brunswick, Canada
• Wedge Island, Nova Scotia, Canada
• Whyte Islet in West Vancouver, British Columbia, Canada

• 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,^[2] Harpswell, Maine
• Tskawahyah Island of Cape Alava, Washington

• 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.

• Matakana Island in Tauranga Harbour
• Opahekeheke Island in the Kaipara Harbour
• Puddingstone Island in Otago Harbour
• Rabbit Island, Bells Island, and Bests Island in Tasman Bay
• The Hauraki Gulf islands of Motutapu Island and Rangitoto Island are connected at low tide
• The Okatakata Islands in Rangaunu Harbour

• Islet
• Presque-isle
• Tied island
• Vanishing island

• Media related to Tidal islands at Wikimedia Commons