Blue Lagoon, Former slate quarry in Pembrokeshire National Park, Wales.
Blue Lagoon is a flooded slate quarry with steep rock walls and a deep water basin. The site features mineral deposits that create distinctive color patterns in the water, framed by dramatic natural cliffs.
The St Brides slate quarry operated until 1910, when fishermen detonated the seaward wall. This event transformed the site into the water-filled basin visible today.
The site draws water sports enthusiasts who train and gather here regularly. The steep slate walls create a natural amphitheater where visitors watch activities unfold below.
The site is reached via a short walking path from Abereiddy Beach car park. Good footwear is recommended as the terrain around the cliff edges can be uneven and rocky.
The water displays shifting color tones depending on light and mineral content. On sunny days the lagoon shines in vivid blue hues that reflect off the steep rock walls.
Location: Pembrokeshire
Address: Abereiddi: SA62 6DT, Abermawr: SA62 5UX, UK
Phone: +441437720385
Website: http://nationaltrust.org.uk/abereiddi-abermawr
GPS coordinates: 51.93790,-5.20917
Latest update: December 6, 2025 19:03
Wales features a region with three national parks, including Brecon Beacons and the Pembrokeshire coast park, as well as fortresses like Conwy and Caernarfon castles built by Edward I in the 13th century, and religious buildings such as St. David's Cathedral. The coastline alternates between red sandstone cliffs, sandy beaches, and islands like Anglesey, while the inland reveals mountains, lakes, and valleys such as the Elan Valley with its historic dams. Welsh towns preserve their architectural heritage, with Cardiff as the capital. The Gower Peninsula offers limestone cliffs and sea caves, Tintern Abbey has been a Cistercian monastery since 1131, and Powis Castle features terraced gardens. Former mining regions and botanical sites reflect the country's industrial and cultural evolution.
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