Question: What landmark is located in Caithness, Scotland, and west of John o' Groats?

full_context: Document 1: Castletown, Highland: Castletown (Scottish Gaelic: "Baile a' Chaisteil" ) is a village on the north coast of the Highland council area of Scotland, situated near Dunnet Bay. It is within the civil parish of Olrig, where it is the main settlement, and within the historic county of Caithness. The A836 links the village with Thurso and Tongue in the west and with John o' Groats in the east. The B876-A99 links the village with Wick in the southeast.
Document 2: Castle of Mey: The Castle of Mey (formerly Barrogill Castle) is located in Caithness, on the north coast of Scotland, about 6 mi west of John o' Groats. In fine weather there are views from the castle north to the Orkney Islands.
Document 3: John o' Groats: John o' Groats (Scottish Gaelic: "Taigh Iain Ghròt" ) is a village 2.5 mi NE of the village of Canisbay, Caithness, in the far north of Scotland. John o' Groats lies on Britain's northeastern tip, and is popular with tourists as one end of the longest distance between two inhabited British points on the mainland, with Land's End in Cornwall lying 876 mi to the southwest. It is not the most northerly point on the island of Britain (nearby Dunnet Head is further north).
Document 4: Dunvegan Castle: Dunvegan Castle is located 1 mi to the north of Dunvegan on the Isle of Skye, off the west coast of Scotland. It is the seat of the MacLeod of MacLeod, chief of the Clan MacLeod. Probably a fortified site from the earliest times, the castle was first built in the 13th century and developed piecemeal over the centuries. In the 19th century the whole was remodelled in a mock-medieval style. The castle is built on an elevated rock overlooking an inlet on the eastern shore of Loch Dunvegan, a sea loch.
Document 5: Cowie Castle: Cowie Castle is a ruined fortress in Aberdeenshire, Scotland. The site lies at the northern end of Stonehaven on the North Sea coast. To the immediate south is the Cowie Bridge crossing of the Cowie Water. Evidence of prehistoric man exists in the vicinity dating to the Iron Age in the form of ring cairns.
Document 6: Bowdun Head: Bowdun Head is a headland landform on the North Sea coast approximately one kilometre south of Stonehaven, Scotland.(Ordnance Survey, 2004) Slightly to the north is another headland, Downie Point. Somewhat to the south along the coast is Dunnottar Castle. Other historic structures in the general vicinity include the Stonehaven Tolbooth, Fetteresso Castle, the Chapel of St. Mary and St. Nathalan and Muchalls Castle. There is considerable prehistory associated with the local area including Bronze Age archaeological sites at Fetteresso (Hogan, 2008) and Spurryhillock, both somewhat inland of Bowdun Head.
Document 7: Castle Sinclair Girnigoe: Castle Sinclair Girnigoe is located about 3 miles north of Wick on the east coast of Caithness, Scotland. It is considered to be one of the earliest seats of Clan Sinclair. It comprises the ruins of two castles: the 15th-century Castle Girnigoe; and the early 17th-century Castle Sinclair.
Document 8: Canty Bay: Canty Bay is a coastal hamlet off the A198, in East Lothian, Scotland, situated opposite the Bass Rock and Tantallon Castle. Settlements nearby include Auldhame, Scoughall, Seacliff, and the Peffer Sands.
Document 9: Thurso Castle: Thurso Castle (alternatively, Castrum De Thorsa, Castle of Ormly, and Castle of Ormlie) is a ruined 19th-century castle, located in Thurso, Caithness, in the Scottish Highlands. Situated in Thurso East, off Castletown Road, east of the River Thurso, the site can be seen from across the river. The current castle ruins date to 1872; A large part was demolished in 1952, although there has been a fortress here since the 12th century. Part of the castle is still habitable and remains a home of the Viscounts Thurso.
Document 10: Dunnet Head: Dunnet Head (Scottish Gaelic: "Ceann Dùnaid" ) is a peninsula in Caithness, on the north coast of Scotland. Dunnet Head includes the most northerly point of the mainland of Great Britain. The point, known as Easter Head, is at (grid reference [ ND202767] ), about 18 km west-northwest of John o' Groats and about 20 km from Duncansby Head. Dunnet Head can be seen also as the western limit of the Pentland Firth on the firth's southern, or Caithness, side (Duncansby Head is the eastern limit). Although Easter Head is the most northerly point on the Scottish mainland, the northernmost point of Scotland lies in the Shetland islands, approximately 170 miles further north.
Document 11: Huna, Caithness: Huna is a small remote crofting township, located 2 miles northeast of Canisbay and 3 miles west of John o' Groats in Caithness, in Scotland. It is currently part of the Highland Council area. Huna is located 0.5 miles from John o' Groats.
Document 12: Castlebay: Castlebay (Scottish Gaelic: "Bàgh a' Chaisteil" ) is the main village and a community council area on the island of Barra in the Outer Hebrides, Scotland. The village is located on the south coast of the island, and overlooks a bay in the Atlantic Ocean dominated by Kisimul Castle, as well as nearby islands such as Vatersay. Castlebay is also within the parish of Barra. The village is located on the A888, which serves as a circular road around Barra.
Document 13: Moray: Moray ( ; Scottish Gaelic: "Moireibh" or "Moireabh ", Latin: "Moravia" , Old Norse: "Mýræfi" ) is one of the 32 Local Government council areas of Scotland. It lies in the north-east of the country, with coastline on the Moray Firth, and borders the council areas of Aberdeenshire and Highland.
Document 14: Harrow, Caithness: Harrow is a hamlet on the north coast of the British Isles in Caithness, Scotland. It lies just to the west of the Castle of Mey and northeast of the Loch of Mey.
Document 15: Catterline: Catterline is a coastal village on the North Sea in Aberdeenshire, Scotland. It is situated about six kilometres south of Stonehaven; nearby to the north are Dunnottar Castle and Fowlsheugh Nature Reserve. Other noted architectural or historic features in the general area include Fetteresso Castle, Fiddes Castle, Chapel of St. Mary and St. Nathalan and Muchalls Castle.
ground_truth: Castle of Mey