Dunnet Head is a peninsula

Peninsula

A peninsula is a piece of land that is bordered by water on three sides but connected to mainland. In many Germanic and Celtic languages and also in Baltic, Slavic and Hungarian, peninsulas are called "half-islands"....

 in Caithness

Caithness

Caithness is a registration county, lieutenancy area and historic local government area of Scotland. The name was used also for the earldom of Caithness and the Caithness constituency of the Parliament of the United Kingdom . Boundaries are not identical in all contexts, but the Caithness area is...

, on the north coast of Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, that includes the most northerly point

Extreme points of the United Kingdom

This is a list of the extreme points of the United Kingdom: the points that are farther north, south, east or west than any other location. Traditionally the extent of the island of Great Britain has stretched "from Land's End to John o' Groats" .This article does not include references to the...

 of the mainland

Mainland

Mainland is a name given to a large landmass in a region , or to the largest of a group of islands in an archipelago. Sometimes its residents are called "Mainlanders"...

 of Great Britain

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

. The point, known as Easter Head, is at 58°40′21"N 03°22′31"W (grid reference

British national grid reference system

The Ordnance Survey National Grid reference system is a system of geographic grid references used in Great Britain, different from using latitude and longitude....

 ), about 18 km (11.2 mi) westnorthwest of John o' Groats

John o' Groats

John o' Groats is a village in the Highland council area of Scotland. Part of the county of Caithness, John o' Groats is popular with tourists because it is usually regarded as the most northerly settlement of mainland Great Britain, although this is not a claim made by the inhabitants...

 and about 20 km (12.4 mi) from Duncansby Head

Duncansby Head

Duncansby Head is the most north-easterly part of the Scottish mainland, including even the famous John o' Groats, Caithness, Highland...

. Dunnet Head can be seen also as the western limit of the Pentland Firth

Pentland Firth

The Pentland Firth , which is actually more of a strait than a firth, separates the Orkney Islands from Caithness in the north of Scotland.-Etymology:...

 on the firth

Firth

Firth is the word in the Lowland Scots language and in English used to denote various coastal waters in Scotland and England. In mainland Scotland it is used to describe a large sea bay, or even a strait. In the Northern Isles it more usually refers to a smaller inlet...

's southern, or Caithness, side (Duncansby Head is the eastern limit).

The headland's

Headlands and bays

Headlands and bays are two related features of the coastal environment.- Geology and geography :Headlands and bays are often found on the same coastline. A bay is surrounded by land on three sides, whereas a headland is surrounded by water on three sides. Headlands are characterized by high,...

 boundary with the rest of the Scottish mainland can be defined as a north-south line running from Little Clett  to the mouth of Dunnet Burn  in Dunnet Bay.