Muckle Skerry lies in the Pentland Firth at grid reference ND464782.

At one kilometre (five furlongs) long and rising to an elevation of 20 metres (65 feet) above sea level, it is sizable enough to be considered an island.

The skerry is part of the Pentland Firth Islands Important Bird Area (IBA), so designated by BirdLife International because it supports significant breeding populations of seabirds.

[3] Pentland Skerries Lighthouse was constructed in 1794 by the Commissioners of the Northern Lights.

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