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Fastnet Rock (from Old Norse: Hvasstann-ait meaning "sharp-tooth ait" — called in Irish: Carraig Aonair, meaning "solitary rock / lone rock") is a small clay-slate island with quartz veins and the most southerly point of Ireland, 6.5 km southwest of Cape Clear Island (Oileán Chléire) in County Cork, which is itself 13 km (8 miles) from the mainland. It lies in the Atlantic Ocean 11.3 km south of mainland County Cork, at latitude 51.37°N. It rises to about 30 m above low water mark.
Source:
Wikipedia - Fastnet Rock