A tidal island is a piece of land that is connected to the mainland by a natural or man-made causeway that is exposed at low tide and submerged at high tide. 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 their natural fortifications.
Ma Shi Chau in Tai Po District, northeastern New Territories, within the Tolo Harbour
Naaz islands in Persian gulf, southern seashore of Qeshm island
Jindo Island and Modo Island in southwest South Korea
Channel Islands
Lihou in Guernsey, one of the Channel Islands
Mandø Island – on Denmark's western coast
Knudshoved Island – north of Vordingborg on southern Zealand, Denmark
Île Madame in Charente-Maritime
Île de Noirmoutier in Vendée
Mont Saint-Michel in Normandy
Tombelaine in Normandy
The Halligen in the North Frisian Islands, Germany/Denmark
The Neuwerk in the Wadden Sea, Germany
Ireland
Coney Island near Rosses Point, County Sligo
Omey Island in Connemara, County Galway, Connacht
Inishkeel, County Galway, Connacht
Iceland
Grótta in Seltjarnarnes in Capital Region
Cortegada Island in Pontevedra coast, Galicia.
San Nikolas Island in Lekeitio, Bizkaia
Asparagus Island in Cornwall, England
Baleshare in the Outer Hebrides, Scotland
Brough of Birsay in Orkney, Scotland
Burgh Island in Devon, England
Burrow Island in Portsmouth Harbour, England
Burry Holms on the Gower, Wales
Castle Stalker on Loch Laich in Argyll, Scotland
Chapel Island in Cumbria, England
Chiswick Eyot in the River Thames
Cramond Island in the Firth of Forth, Scotland
Davaar Island near Campbeltown, on the Kintyre peninsula, Scotland
Eilean Shona in Loch Moidart, Scotland
Eilean Tioram, in Loch Moidart, Lochaber, Highland, Scotland on which is situated Castle Tioram
Erraid off the Isle of Mull in Scotland
Gateholm off the south west coast of Pembrokeshire, Wales
Gugh in the Isles of Scilly, Great Britain
Hestan Island near Rough Island, Scotland in Auchencairn Bay, Scotland
Hilbre Island, Middle Eye and Little Eye in the River Dee estuary, between North Wales and the English Wirral
Horsey Island in Essex, England
Islands of Fleet: Ardwall Isle & Barlocco Isle in Galloway, Scotland
Isle Ristol, the innermost of the Summer Isles in Scotland
Kili Holm in Orkney, Scotland
Lindisfarne in Northumberland, England
Ynys Llanddwyn off Anglesey in north Wales
Mersea Island in Essex, England
Mumbles Lighthouse located in Mumbles, near Swansea
Northey Island in Essex, England
Oronsay in the Inner Hebrides, Scotland
Osea Island in Essex, England
Piel Island in Cumbria, England
Ray Island in Essex, England
Rough Island opposite Rockcliffe, Dumfries & Galloway, Scotland
Sheep Island in Cumbria, England
St Catherine's Island in Pembrokeshire, Wales
St Mary's Island in North Tyneside, England
St Michael's Mount in Cornwall, Great Britain
Sully Island in the Vale of Glamorgan, Wales
Worm's Head at the end of Gower, Wales
Ynys Gifftan in Gwynedd, north Wales
Ynys Lochtyn on the coast of Cardigan Bay, Wales
43 (unbridged) tidal islands can be walked to from the UK mainland.
Micou's Island in St. Margarets Bay, Nova Scotia, Canada
Minister's Island in New Brunswick, 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
Cana Island Lighthouse in Wisconsin
Charles Island, in Connecticut
Douglas Island in Alaska
High Island, New York
Long Point Island, Harpswell, Maine
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 and Walker Island in Rangaunu Harbour
