The Blue Lagoon, Abereiddi

Overlooking the Blue Lagoon from the rocks

Abereiddi’s Blue Lagoon is surrounded by rugged rocks and the remaining ruins still hint at the area’s industrial past.

An industrial past

The lagoon just to the north of the beach, was formerly the main slate quarry of the St Brides Slate Company and was active up until 1910. The slate gives a brilliant aqua blue colour to the water. It is a popular spot for coasteering and climbing along the cliffs at sea level.

A former slate quarry

Pembrokeshire played a lead role in the slate industry, with around 100 quarries in the county in the late 18th century.

Slate that was extracted from Abereiddi was transported by tramway to the neighbouring Porthgain Habour and shipped out. The quarry itself was active until the early 20th century and later abandoned and flooded.

The Blue Lagoon was formed when the channel connecting the quarry to the sea was blasted, allowing the sea to flood in.

Ruined quarry buildings still sit on the clifftop, with the remains of the workmen’s cottages adjacent to the car park. You’ll also spot the foreman’s house and the powder store here.

The Blue Lagoon
The Blue Lagoon Abereiddi
The Blue Lagoon

Beautiful beaches and rocks

Bordered by beautiful beaches and craggy rocks, it’s also a very popular spot for coasteering and kayaking, and many enjoy taking the plunge as part of an organised activity group. Be careful, the water is deep and cold.

Or keep your feet firmly on the ground and go for a walk along the clifftop instead… you’re guaranteed great views.