Duncansby Head ( or Dùn Gasbaith) is the most northeasterly part of both the Scottish and British mainlands, slightly northeast of John o' Groats. It lies approximately 20 km (12 mi) east-southeast of Dunnet Head, the northernmost point of both the Scottish and British mainlands. Duncansby Head is located in Caithness, Highland, in north-eastern Scotland. The headland juts into the North Sea, with the Pentland Firth to its north and west and the Moray Firth to its south. Lighthouse The point is marked by Duncansby Head Lighthouse, built by David Alan Stevenson in 1924. A minor public road leads from John o' Groats to Duncansby Head, which makes Duncansby Head the farthest point by road from Land's End. The Duncansby Head Site of Special Scientific Interest includes the stretch of coast south to Skirza Head. It includes the Duncansby Stacks, prominent sea stacks just off the coast. Atomic Weapon Test In 2016, it was reported in The Sunday Post newspaper that scientists from the Atomic Weapons Establishment in Aldemarston had proposed a nuclear weapon test on the Stacks of Duncansby in 1953, but that the prevailing wet weather was too much for contemporary electronics and the idea was shelved. See also List of lighthouses in Scotland List of Northern Lighthouse Board lighthouses References External links Northern Lighthouse Board Headlands of Scotland Caithness Sites of Special Scientific Interest in Caithness Landforms of Highland (council area)