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The Blue Lagoon is a breached quarry that’s now full of turquoise sea water, hence the name. It’s one of the top activities to do in St David’s and is really easy to visit by car or public transport.

I recently visited myself and in this guide, I’ll explain exactly what the Blue Lagoon is, how to get there, and all the things to do nearby.

What is the Blue Lagoon?

The Blue Lagoon is a large disused slate quarry just north of Abereiddi beach. The walls of the quarry have been breached so it is now full of seawater. Around the area, you can still see old buildings and the route of an old tramway that served the quarry.

The lagoon appears as aqua blue or sometimes even green colour due to the slate rock which is known to have a slightly blue tint in this area1 (source: National Trust).

At its deepest, the Blue Lagoon is 25m deep2 (source: Wikipedia).

Today, the quarry is part of the Arfordir Abereiddi SSSI (Site of Special Scientific Interest) which is noted for its geology and fossil assemblages. It is also protected as a National Trust site for its industrial archaeology3 (source: A. Mitten and J.K. Pringle, Geology Today, Vol. 34, No. 1, pp. 35-38).

How To Visit the Blue Lagoon

The Blue Lagoon is found on the Wales Coastal Path, just 5 minutes walk from Aberdeiddy beach. The route is well signposted from the beach.

The Blue Lagoon is free to visit and is open 24 hours a day, 7 days per week. However, it may be closed to the public at certain times of the year when seals are known to breed here. You can find out details of any planned closures on the National Trust website.

If visiting the Blue Lagoon by public transport, you can take the Strumble Shuttle service 404 which drops off around 200m from the car park at Aberdeiddy beach. This service runs from Fishguard to St David’s. Find the full timetables here (note that services differ in the off-season).

Where To Park for the Blue Lagoon?

Parking for the Blue Lagoon is at Aberdeiddy Beach car park. There is an all-day parking charge between April and October which is £4 per car or £10 per minibus. Payment is via cash or card to the onsite parking attendant. Overnight camping is prohibited here.

From the car park, it’s just a 5-minute walk to reach the Blue Lagoon. Follow the coastal path at the far side of the car park.

Is the Blue Lagoon Accessible?

The pathway from the car park to the Blue Lagoon is reasonably well surfaced and therefore quite accessible for wheelchairs and pushchairs. However, once you reach the Blue Lagoon, the activities you could do are quite limited so I wouldn’t recommend it for those with mobility problems.

Things To Do at the Blue Lagoon

You can spend several hours visiting Aberdeiddy beach and the Blue Lagoon so you’ll get good value from the parking charge. Here are all the best things to do at the lagoon.

1. Climb to the Viewpoint

When you arrive at the blue lagoon, the beautiful turquoise waters are quite a sight to behold. However, for an even better view, I recommend climbing up to the very top of the cliff to get a great panoramic view of the lagoon and its surroundings.

On top of the cliffs, you can see the route of an old tramway that once connected the quarry with the Harbour at Porthgain.

2. Go Swimming

The most popular activity at the Blue Lagoon is swimming. It’s safe to swim in the Blue Lagoon which has a high level of water quality (as measured by Natural Resources Wales at Abereiddi beach).

You’ll frequently see adults, children, and even dogs swimming in the Blue Lagoon. Due to the nature of the lagoon as an enclosed

3. Kayak Around the Lagoon and Surrounding Cliffs

It’s possible to kayak and paddleboard in the Blue Lagoon too. You can take your kayak through the gap in the old quarry and out into the sea. The cliffsides around this area of full of interesting caves and crevices that are worth exploring.

4. Try Coasteering

© Crown copyright (2022) Cymru Wales

The Blue Lagoon is a popular coasteering spot in Wales with the specialist outdoor company Celtic Quest. Coasteering is when you scramble along the cliffs, like a coastal version of canyoning.

With Celtic Quest, you’ll climb and abseil along the cliffs, explore caves and rockpools, as well as swimming around the coast.

Activities will be tailored to your ability and any jumps are optional. Check out their website for more information and booking details.

5. Cliff Jumping

The Blue Lagoon is a popular place for cliff jumping (also known as tombstoning) in Wales. In fact, it’s been the chosen spot for the Red Bull Cliff Jumping in the UK in 2012, 2013, and 20164 (source: BBC). You can watch some of the clips here.

Whilst the 27m high platform installed for the Red Bull events is no longer there, you can still get a taste for the adrenaline sport with three platforms built into the edge of the quarry on the far side of the lagoon, these are 2m, 6m, and 10m high.

A word of warning: You should not attempt to cliff jump from anywhere else around the Blue Lagoon. Ensure the previous person has fully cleared the area below and only jump when the tide is high. Jump feet first, legs straight and arms across the chest. There have been serious injuries here when it is done incorrectly5 (source: The National). The shock of the cold water can also be dangerous so be sure to take a dip before you jump.

6. Visit Abereiddi Tower

From the lagoon, you may be able to see a small tower in the distance on top of the clifftops, this is Aberdeiddy Tower. This is a Grade II listed building although its purpose is unclear. Some suggest it was a watch tower built in the 18th century whereas others suggest it’s an aerial navigation aid6 (source: CADW).

Either way, it’s a beautiful vantage point for some stunning selfies, especially at sunset. To reach Abereiddi Tower, you’ll need to make your way up to the top of the cliff, then scramble across the small gap in the cliff shown here. It’s not easy but worth the effort.

7. Walk the Coastal Path to Porthgain

The Blue Lagoon is located right on the Wales Coastal Path so why not take the opportunity to walk along the coastline whilst you’re there?

A popular walk is the Aberdeiddy to Porthgain circular walk. This moderate walk is 4 miles (6.4 km) and takes around 1hr20 to complete. You’ll explore some of the best coastlines and get a glimpse into the area’s industrial past as you visit the tiny fishing port at Porthgain which once shipped stone from the quarry across the country.

Find a full map and instructions for this walk here.

Related Questions

How Far is Blue Lagoon from Tenby?

The Blue Lagoon is 40 miles (65km) from Tenby. This takes around 1hr 10 minutes by car.

How Far is the Blue Lagoon from St David’s?

The Blue Lagoon is just over 5 miles (8.5km) from St David’s. This takes around 14 minutes by car. There is also a public bus (service 404) that runs this route several times per day and takes 16 minutes.

Kieren is the founder and editor-in-chief of Wales Guidebook. Originally from rural Mid-Wales, he has lived all over the country from Cardiff to Wrexham. A true Welshman, Kieren created this site to share his passion for Wales and help others discover this beautiful country.