Secret & Safe Coastal Swimming Spots in Britain
If you’re searching for hidden UK swimming spots in safer, enclosed waters, you’re in the right place. Beyond the crowded beaches and well-known lidos, the UK coastline is filled with secret coves, tidal pools, and wild swimming locations waiting to be discovered.
From turquoise lagoons in Wales to tucked-away mermaid pools in Cornwall, these are some of the best hidden coastal swimming spots in the UK for your next adventure.
Blue Lagoon, Pembrokeshire (Wales)
One of the most striking wild swimming spots in Wales, the Blue Lagoon in Pembrokeshire is a former slate quarry transformed into a deep, jewel-toned pool.
Surrounded by rugged cliffs, the water shifts between turquoise and deep blue depending on the light. It’s a popular spot for experienced swimmers and cliff jumpers, thanks to its depth and dramatic setting.
Good to know:
Best for confident swimmers
Deep water with changing conditions
Ideal on calm, clear days
Kynance Cove Mermaid Pools, Cornwall
Kynance Cove is famous for its white sand and dramatic rock formations—but hidden within it are some of Cornwall’s most beautiful natural swimming pools.
At low tide, the mermaid pools reveal themselves: crystal-clear, sheltered pockets of water perfect for a calm sea swim. The turquoise colour on sunny days makes this one of the most photogenic hidden swimming spots in Cornwall.
Tip: Visit at low tide for the best conditions and access.
Secret Mermaid Pool, North Cornwall
Along Cornwall’s north coast lies one of the region’s best-kept secrets—a hidden tidal lagoon that only appears when the tide goes out.
Completely submerged at high tide, this secret sea swimming spot in the UK feels like a hidden world when revealed. Calm, sheltered, and often empty, it’s perfect if you’re looking to escape the crowds.
Why it’s special:
Invisible at high tide
Quiet even in peak season
Feels like a true hidden gem
Walpole Bay Tidal Pool, Kent
For a more accessible option, Walpole Bay offers the largest tidal pool in the UK. While not entirely hidden, it’s often overlooked compared to trendier swimming spots.
Its sheltered waters make it ideal for a relaxed swim, and it’s a great introduction to sea swimming in the UK if you’re just getting started.
Bude Sea Pool, Cornwall
Bude Sea Pool is a favourite among locals looking for a safer alternative to the Atlantic waves.
Carved into the rock and naturally refreshed by the tide, it offers a calm and clean swimming environment with stunning coastal views. It’s perfect when conditions in the open sea are too rough.
Porthtowan Rock Pools, Cornwall
Porthtowan’s wild Atlantic setting hides a number of natural rock pools along its coastline.
These pools provide a more secluded wild swimming experience in Cornwall, but timing is key. The area can be exposed to strong waves, so always check conditions before heading in.
Gower Peninsula Hidden Coves, Wales
The Gower Peninsula is one of the UK’s best regions for discovering hidden coastal swimming spots.
With miles of unspoiled coastline, you’ll find countless rock pools and tucked-away coves. The Blue Pool at Broughton Bay is a standout, but the real reward is exploring and finding your own secret place to swim.
Isle of Skye, Scotland
For those seeking a more adventurous experience, the Isle of Skye offers some of the UK’s most dramatic wild swimming locations.
The Fairy Pools are the most famous, with clear, cascading water set against a rugged mountain backdrop. While increasingly popular, visiting early or off-season still offers a quieter, more remote feel.
Be prepared:
Cold water year-round
Remote conditions
Rapid weather changes
Why These Hidden UK Swimming Spots Are Worth It
Choosing lesser-known locations means:
Fewer crowds
Cleaner, calmer water
A more immersive nature experience
Whether you’re into wild swimming, coastal hiking, or weekend adventures, these hidden spots offer something far more memorable than a typical beach day.
Planning Your Own Coastal Swimming Adventure
If you’re inspired to explore these hidden UK sea swimming spots, always keep safety in mind:
Check tides and weather conditions
Never jump without checking depth
Swim with others where possible
Respect local environments
Discover More Coastal Adventures
At Days On The Coast, we explore the UK’s most beautiful and lesser-known coastal locations—from hidden swimming spots to scenic hikes and weekend escapes.
If you’re looking to experience these places with like-minded people, stay tuned for upcoming adventures along the UK coastline.
