These four causeways were built after the sinking of the HMS Royal Oak while it lay at harbour in Scapa Flow in October 1939.
Barrier No 1 is over 2,000 feet (610 metres) in length. The maximum depth below the highest tide level is 59 feet (18 metres) After the war, a road was built on top of the barriers allowing the south isles of Lamb Holm, Glimps Holm, Burray and South Ronaldsay to become part of the main roadway system of Orkney. The area is popular with divers, sea-anglers and also have some nice beaches.
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