It is home to a 42-foot-tall (13 m) lighthouse, which was built in 1893 and automated in 1967.

[3] It is a tidal island that used to be connected to Shapinsay.

It is still possible to walk across from the mainland during very low tides The island also has the ruins of a broch, cairn and chapel.

[4] In the Orkneyinga Saga it is referred to as both "Hellisey" and "Eller Holm" [5] and John of Fordun refers to it as "Helene-holm"

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