Located in the Orkney Islands, in the Northern Isles of Scotland, the Churchill Barriers is a serie of four causeways, originally built as naval defenses linking a serie of small islands on the east side of Scapa Flow.
The four Churchill Barriers are solid road causeways that were built in the 1940s primarily as naval defences to protect the anchorage at Scapa Flow. Today, serve as road, carrying the A961 road that link Orkney's mainland via the islets of Lamb Holm and Glimps Holm to Burray and South Ronaldsay.
The total length of the four causeways is 1.5 miles (2.4 km). It’s forbidden to stop on the causeway. Do not travel this road in severe weather conditions. Drivers cross at own risk.