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Ern Stack is a sea stack off Yell, in Shetland, Scotland.
Map of Ern Stack, Shetland, UK
The word "ern" means an eagle (it is a cognate of, for example, Swedish "örn"), and it is said that the Eigg, and Ern Stack in the north west of Yell, were the last known nesting site of Shetlandic sea eagles, which were recorded there in 1910.
References
Ern Stack Wikipedia(Text) CC BY-SA