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 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.