Muckle Skerry is the largest of the Pentland Skerries that lie off the north coast of Scotland. It is home to the Pentland Skerries Lighthouse. Muckle Skerry lies in the Pentland Firth at . It is the westernmost of the skerries. At long and rising to an elevation of above sea level, it is sizable enough to be considered an island. However the notoriously bad weather of the firth has historically rendered Muckle Skerry uninhabitable and as such it is more often thought of as a skerry. Pentland Skerries Lighthouse Pentland Skerries Lighthouse was constructed in 1794 by the Commissioners of the Northern Lights. The engineers were Thomas Smith and his stepson Robert Stevenson (this was the first light that Stevenson officially worked on). See also List of lighthouses in Scotland List of Northern Lighthouse Board lighthouses References External links Pentland Skerries Northern Lighthouse Board Northern Lighthouse Board Uninhabited islands of Orkney Skerries of Scotland