Holyhead Mountain (Mynydd Twr in Welsh: from (pen)twr, meaning "stack") is the highest hill on Holy Island, Anglesey, and the highest in the county of Anglesey, north Wales. It lies about two miles west of the town of Holyhead, and slopes steeply down to the Irish Sea on two sides. There is a late Roman watchtower, called Caer y Tŵr (Tower Fortress) on the east side of the hill. Holyhead Mountain also has an Iron Age Stone Circle settlement and the material for the Breakwater was quarried from the Mountain too. It is the first sight of land people have when travelling from Dublin to Holyhead.
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Isle of Anglesey