Tidal island



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.

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

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

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
 * 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

Northern Ireland

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

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 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

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.

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
 * Bird Islet in Neck Point Park, Nanaimo, British Columbia, Canada

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

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



 * 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