The Pentland Firth, which is actually more of a strait than a firth, separates the Orkney Islands from Caithness in the north of Scotland.
The small PentlandSkerries group are in the east.
The Firth is well known for the strength of its tides, being among some of the fastest in the world, a speed of 16 knots being reported close west of PentlandSkerries.
John o' Groats, on the Pentland Firth in the far northeast of Scotland, is often mistakenly thought to be mainland Britain's most northerly point.
The PentlandSkerries, 8 km/5 mi northeast of Duncansby Head, include two islets, one of which has a lighthouse.
This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.