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Fairbourne Anti-invasion Defences is a Second World War coastal defence site located on the Cardigan Bay coast of Merionethshire, Wales. The monument comprises earthworks and structures erected as part of the wider Stop Line strategy implemented across Britain following the threat of German invasion after 1940. The site occupies ground underlain by Upper Cambrian bedrock of the Tremadoc Formation, composed of mudstone, siltstone and sandstone typical of this ancient seabed geology, which would have presented particular challenges for foundation works during hasty wartime construction.
The defences at Fairbourne include anti-tank obstacles, gun emplacements, pillboxes and associated entrenchments positioned to command the beach and prevent amphibious landing. The low-lying coastal terrain here, with its extensive sand and shingle, formed a strategically important sector requiring substantial fortification. The physical remains reflect the scale of investment in home defence infrastructure during the critical years of the Second World War.
The site is protected as a scheduled monument under Cadw's protection scheme, reference ME252. As archaeological and historical evidence of wartime emergency preparations, these defences retain considerable significance for understanding Wales's experience of the war and the landscape modifications undertaken to safeguard against invasion. The monuments survive substantially intact within the modern coastal settlement of Fairbourne.
Fairbourne Anti-invasion Defences is a scheduled monument protected by Cadw under reference ME252. View the official record →
Fairbourne Anti-invasion Defences is a Second World War coastal defence site located on the Cardigan Bay coast of Merionethshire, Wales. It is designated a Scheduled Ancient Monument by Cadw under reference ME252.
Fairbourne Anti-invasion Defences dates from the modern period, and is classified as a anti invasion defence site. It is one of over 32,000 scheduled monuments protected across the UK.
Fairbourne Anti-invasion Defences is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is ME252.
Several scheduled monuments lie within 10 km, including Allt Lwyd Cairn II (4.4 km), Corn Drying Kiln Near Carn-Gadell Uchaf (4.5 km), Allt Lwyd Cairn I (4.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Fairbourne Anti-invasion Defences's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Fairbourne Anti-invasion Defences stands on Upper Cambrian, Including Tremadoc, bedrock that formed in the Tremadocian. The rock here is mudstone, siltstone and sandstone.