Landowner The National Trust and private ownership. Pembrokeshire County Council manage the toilets and the car park. Activities
  • Coasteering - (subject to permission from Landowners and National Trust - please ring 01646 696134 or email tom.luddington@mhpa.co.uk for details)
  • Kayaking
  • Car Park.
  • Public toilets.
  • Wheelchair Access to Blue Lagoon.
  • Emergency Telephone.
  • Ice cream van in the summer.
Description The site lies within both Abereiddy - Castell Coch Cliffs and Llanfryn Quarries Site of Special Scientific Interest (SSSI) and Abereiddy - Trwyncastell Cliffs and the Blue Lagoon SSSI. It has been designated due to its international importance for geology. The coastal and quarry exposures show rocks of both sedimentary and volcanic origins. Study of the site has given details of conditions 470 million years ago. Volcanic ashes can be seen which have derived from Strumble Head and Ramsey which were active volcano sites at this time. The marine ecosystems found in the Blue Lagoon are unique in south west Britain. The lagoon is dominated by species which are rare on the open coast, with an abundance of suspension feeders (due the siltation of the lagoon) such as sea squirt and bristle worm. There are a variety of sponges, some of which are rare. The Blue Lagoon itself is a man-made structure, formed after the quarry of slate from the area. The now derelict quarryman’s cottages and other quarry buildings can also be seen. Activities Diving. The Blue Lagoon makes a good shore dive and is well-used particularly when rough weather makes more exposed venues untenable. Launching of dive boats larger than 4m is almost impossible - use Porthgain or Porthclais. Surfing/Kayaking. Quite popular for both activities remaining useable when Newgale or Whitesands are “blown out” but beware powerful rips on the north side and rocky reef within the surf zone! It is probably friendliest at mid to low tide. For novice kayakers, the lagoon itself offers safe, sheltered but deep water. Coasteering. A popular trip used by local centres from the beach out to the Lagoon. Things become progressively more serious beyond with friable cliffs, strong tidal currents and no easy emergency exit. Important Information National Trust byelaws apply on their land and should be complied with at all times. There are hidden ledges and rocks in the Blue Lagoon, jumping in can be very dangerous. Visitors using the tidal zone must be aware of the tidal activity for the day and be aware that certain tidal/weather conditions can cause treacherous currents. (Particularly in Traethllyfn Beach). Coasteering routes have been agreed by the National Trust with local Outdoor Pursuits Centres, any new routes wishing to be done by existing groups or new groups wishing to use the site should contact the National Trust. Slate should not be removed from quarry buildings. Hammering and the removal of geological samples is forbidden. The rocky shore is sensitive, samples should not be removed. The Lagoon itself is an important seal pupping area and disturbance to the seals and their pups should be avoided (Sept - Dec). Useful Contact Numbers
  • The National Trust – 01646 661359
  • Pembrokeshire Coast National Park – 0845 345 7275
  • Milford Haven Coast Guard – 01646 690909
  • Countryside Council for Wales - 01646 636736