The Blue Lagoon, Abereiddi

Overlooking the Blue Lagoon from the rocks

Abereiddi’s Blue Lagoon is world-class for watersports, but its rugged rocks and ruins still hint at the area’s industrial past.

Rocky roots

The lagoon is actually a former slate quarry and was active up until 1910, before being abandoned and flooded.

Its rocky roots have paved the way for all sorts of adventure, including diving, coasteering and wonderful walks.

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, along what was called The Row. You’ll also spot the foreman’s house and the powder store here.

Red Bull Cliff Diving at the Blue Lagoon
Crowds at the Red Bull Cliff Diving World Championships

Dive right in

Bordered by beautiful beaches and craggy rocks, the lagoon is world-class for watersports.

The Red Bull Cliff Diving World Series visited the Blue Lagoon in 2012 – the first time the event had ever been held in the UK. We were delighted to host the event again in 2013 and 2016.

It’s also a very popular spot for coasteering and kayaking, and you’re welcome to take 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.