Port Penrhyn ( cy, Porth Penrhyn) is a harbour located just east of Bangor in north

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

at the confluence of the River Cegin with the Menai Strait. It was formerly of great importance as the main port for the export of slate from the

Penrhyn Quarry The Penrhyn quarry is a slate quarry located near Bethesda, North Wales. At the end of the nineteenth century it was the world's largest slate quarry; the main pit is nearly long and deep, and it was worked by nearly 3,000 quarrymen. It has ...

, the largest slate quarry in the world at the end of the nineteenth century. It was built, and later expanded, by the Pennant (later Douglas-Pennant) family of the nearby

Penrhyn Castle Penrhyn Castle ( cy, Castell Penrhyn) is a country house in Llandygai, Bangor, Gwynedd, North Wales, constructed in the style of a Norman castle. The Penrhyn estate was founded by Ednyfed Fychan. In the 15th century his descendent Gwilym a ...

. ''Penrhyn'' is the Welsh word for 'promontory'. The port is used by coastal vessels up to about and by fishing vessels.

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