[1] Located in Scapa Flow, between Mainland and Cava, it has a section permanently above sea level.

Formerly known as Carlin Skerry,[4] the rock gained its strange name, not from its shape, or position, as is often the case, but from the annual rent paid on it, by the residents of Orphir.

In return for a barrel of butter per year, they gained permission from the local laird to hunt the seals on it.

[1] On 21 June 1919, the waters between the Barrel of Butter and Cava became full of scuttled German ships, including the SMS Bayern, Markgraf, Cöln, Dresden and König.

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