Caernarfon Bay (occasionally Caernarvon Bay)^[1] is an inlet of the Irish Sea defined by the Llŷn peninsula and Anglesey.

The gentle coastline surrounding it is home to villages including Nefyn, Pistyll, Trefor, Llithfaen , and Clynnog Fawr on the mainland, and Aberffraw, Llanddwyn and Rhosneigr on Anglesey.

The Menai Strait heads north east to link the bay to Conwy Bay.

53°06′N 4°33′W / 53.100°N 4.550°W / 53.100; -4.550

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