Duncansby Head is the most northeasterly part of both the Scottish and British mainlands, slightly northeast of John o' Groats. It lies approximately 20 km east-southeast of Dunnet Head, the northernmost point of both the Scottish and British mainlands. Duncansby Head is in Caithness, Highland, in north-eastern Scotland. The headland juts into the Nort…Duncansby Head is the most northeasterly part of both the Scottish and British mainlands, slightly northeast of John o' Groats. It lies approximately 20 km east-southeast of Dunnet Head, the northernmost point of both the Scottish and British mainlands. Duncansby Head is 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.