John o' Groats in the context of Orkney Isles

Caithness (/keɪθˈnɛs/; Scottish Gaelic: Gallaibh [ˈkal̪ˠɪv]; Old Norse: Katanes) is a historic county, registration county and lieutenancy area of Scotland.

There are two towns, being Wick, which was the county town, and Thurso. The county includes the northernmost point of mainland Britain at Dunnet Head, and also the most north-easterly point at Duncansby Head near John o' Groats. The Flow Country is the largest blanket bog in Europe, and covers a large inland area in the west of the county. Caithness has a land boundary with the historic county of Sutherland to the west and is otherwise bounded by sea. The land boundary follows a watershed and is crossed by two roads (the A9 and the A836) and by one railway (the Far North Line). Across the Pentland Firth, ferries link Caithness with Orkney, and Caithness also has an airport at Wick. The Pentland Firth island of Stroma is within Caithness.

The Moray Firth (/ˈmʌri-/; Scottish Gaelic: An Cuan Moireach, Linne Mhoireibh or Caolas Mhoireibh) is a roughly triangular inlet (or firth) of the North Sea, north and east of Inverness, which is in the Highland council area of the north of Scotland.

It is the largest firth in Scotland, stretching from Duncansby Head (near John o' Groats) in the north, in the Highland council area, and Fraserburgh in the east, in the Aberdeenshire council area, to Inverness and the Beauly Firth in the west.

The A9 is a major road in Scotland running from the Falkirk council area in central Scotland to Scrabster Harbour, Thurso in the far north, via Stirling, Bridge of Allan, Perth and Inverness. At 273 miles (439 km), it is the longest road in Scotland and the fifth-longest A-road in the United Kingdom. Historically it was the main road between Edinburgh and John o' Groats, and has been called the spine of Scotland. It is one of the three major north–south trunk routes linking the Central Belt to the Highlands – the others being the A82 and the A90.

The road's origins lie in the military roads building programme of the 18th century, further supplemented by the building of several bridges in later years. The A9 route was formally designated in 1923, and originally ran from Edinburgh to Inverness. The route was soon extended north from Inverness up to John O'Groats. By the 1970s the route was hampered by severe traffic congestion, and an extensive upgrading programme was undertaken on the 138 miles (222 km) section between Bridge of Allan and Inverness. This involved the bypassing of numerous towns and villages on the route, and the building of several new bridges, notably the Kessock Bridge which shortened the route north out of Inverness by 14 miles (23 km).

Dunnet Head (Scottish Gaelic: Ceann Dùnaid) is a peninsula on the northern coast of Caithness, Scotland, 10.5 miles (17 km) west of John o' Groats. It terminates at Easter Head, the northernmost point on the island of Great Britain.

Duncansby Head (Scottish Gaelic: Ceann Dhunngain 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 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.