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.
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