On South Ronaldsay, it's a 20-minute drive over the Churchill Barriers from Kirwall on the mainland.

The last of four man-made causeways known as the Churchill Barriers linking Orkney's mainland to its scattered and remote south isles.

The Churchill Barriers carry the road from South Ronaldsay to Mainland, Orkney.

The quarry used to build the Churchill Barriers has now been flooded and converted into a fish farm.

It has since been blocked up by the Churchill Barriers.

These "Churchill Barriers" now provide road access from the mainland to Burray and South Ronaldsay, but block maritime traffic.

The shock resulted in rapid changes to dockland security and the construction of the Churchill Barriers around Scapa Flow.

The Churchill Barriers in Orkney are of the most notable sets of causeways in Europe.

The Churchill Barriers were built during World War II to block the eastern entrances.

They constructed the Churchill Barriers, four causeways created to block access to Scapa Flow.