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In page Rockall:

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Rockall is one of the few pinnacles of the surrounding Helen's Reef; it is located 301.3 kilometres (162.7 nautical miles) west of the uninhabited islet of Soay, St Kilda, Scotland,[1] and 423.2 kilometres (263.0 statute miles; 228.5 nautical miles) northwest of Tory Island, County Donegal, Ireland.[2] Its location was precisely determined by Nick Hancock during his 2014 expedition.[3] The surrounding elevated seabed is called the Rockall Bank, lying directly south from an area known as the Rockall Plateau. It is separated from the Outer Hebrides by the Rockall Trough, itself located within the Rockall Basin (also known as the "Hatton Rockall Basin").[citation needed]