Abereiddy is a hamlet in Pembrokeshire, West Wales. The cluster of houses that make up the hamlet stand a few hundred yards back from Abereiddy beach. The beach and the surrounding coastline is a popular location for cliff jumping and coasteering – a method of traversing the coastline using a combination of climbing and swimming.
A large car park adjoins the beach, where in the summer an ice cream van can usually be found. The beach has public toilets which are open from Easter to October half-term. The Wales Coast Path cuts across the beach and offers fine walking in both directions.
Nearby are the ruins of the 'Blue Lagoon', a small slate quarry, now flooded by an inundation of sea water. The Blue Lagoon is some 25m deep and owes its colour to the mineral content within the quarry.
Abereiddy and much of the coastline nearby were once industrial sites where slate and rocks were quarried and exported by sea from harbours such as Porthgain harbour to the north. Ruins of the quarry workers houses known as The Street can still be found set back from the beach at Abereiddy.
The lagoon is a favourite for adventure groups practising coasteering and diving. In September 2012 large crowds were attracted to Abereiddi when the Red Bull Cliff Diving World Series made its UK debut at the Blue Lagoon.