Odd boundaries · Lihou, Guernsey
An island joined by the tide
A causeway alternates between road and seabed according to the tide.
Explore place →MapTheOdd / Guides / Unusual islands and offshore places
Curated atlas guide · 7 mapped records
Unusual islands and offshore places
Restricted islands, tidal islands, sea forts, micronations and remote ecosystems separated from ordinary transport networks.
How this guide works. Places come from coordinate-backed records and open datasets. Verify access, weather, tides, borders and opening arrangements before travelling.
Infrastructure · Thames Estuary, England
Sea forts standing on stilts
Wartime towers remain offshore like fragments of a mechanical city.
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Natural world · Vestmannaeyjar, Iceland
The island born in living memory
A volcanic island emerged from the Atlantic during eruptions in the 1960s.
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Natural world · Socotra, Yemen
The island of dragon’s blood trees
High endemism gives the archipelago a biological character found nowhere else.
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Heritage · Nagasaki, Japan
The concrete island left empty
A densely built mining island was abandoned after coal extraction ended.
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Odd boundaries · Andaman Islands, India
The island legally closed to visitors
A protected island is defined as much by access law as by coastline.
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Odd boundaries · North Sea
The sea fort that declared itself a country
An offshore platform became the centre of a long-running micronation claim.
Explore place →What should I know about unusual islands and offshore places?
MapTheOdd recommends An island joined by the tide, Sea forts standing on stilts, The island born in living memory, The island of dragon’s blood trees, with maps, evidence sources and related records.
Each place page provides coordinates, evidence, seasonal context and related oddities.