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

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

at the confluence of the River Cegin with the

Menai Strait The Menai Strait () is a strait which separates the island of Anglesey from Gwynedd, on the mainland of Wales. It is situated between Caernarfon Bay in the south-west and Conwy Bay in the north-east, which are both inlets of the Irish Sea. The s ...

. It was formerly of great importance as the main port for the export of

slate Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade, regional metamorphism. It is the finest-grained foliated metamorphic ro ...

from the Penrhyn Quarry, the largest slate quarry in the world at the end of the nineteenth century. The quarry and the port were connected by the Penrhyn Quarry Railway. It was built, and later expanded, by the Pennant (later Douglas-Pennant) family of the nearby Penrhyn Castle. ''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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