Cold, calm and deceptively powerful: Why tidal pools are good for you and what can still go wrong

Tidal pools offer swimmers calm water, cold plunges and a safer alternative to the open sea.

They offer a secure ocean experience, but are not risk-free, despite providing a protected environment, shielded from strong currents and heavy waves.

“You’ve got that immersive ocean feeling, without the pounding surf,” explains Van der Westhuzien.

Cold-water immersion has been linked to improved circulation, mood enhancement through endorphin release and possible immune benefits.

“Then there’s the seawater itself,” says Van der Westhuizen. “It’s rich in minerals like magnesium, potassium and iodine, which can be beneficial for skin and overall health.”

She adds that time spent in tidal pools often comes with an unexpected bonus: enforced disconnection.

“You can’t be on your phone. You’re immersed in nature, and that alone helps reduce stress.”

Not stagnant – but not sterile either

A common concern is whether tidal pools become stagnant or unhygienic. According to Van der Westhuizen, most pools are naturally flushed by waves and high tides, while some also have outflow pipes that allow water to circulate back into the ocean.

“They get cleaned regularly by the sea itself,” she explains, adding that swimmers should still avoid swallowing the water, as they would in rivers, oceans or even chlorinated pools.

A coastline mapped, pool by pool

Interest in tidal pools has grown alongside the release of A Guide to Tidal Pools of the Western Cape, a new publication documenting 34 tidal pools across the province.

Author Serai Dowling describes the book as both a practical guide and a cultural exploration.

“Each pool has its own story,” says Dowling. “From swimmability ratings and accessibility to marine life and heritage, this book is an invitation to explore these blue spaces safely and respectfully.”

The guide also includes advice on cold-water swimming, stress reduction and water safety.

Safer than the sea? Not always

Despite their reputation, tidal pools are not automatically safe.

Van der Westhuizen warns that seals and other marine life frequently enter pools, especially at high tide. “This is their habitat. If you arrive and see seals, you don’t swim. You reassess.”

She also cautions against swimming during high tides, when waves can surge over pool walls, sometimes washing swimmers out toward open water. “I’ve seen people nearly pulled into the sea because they weren’t watching the waves.”

Cold exposure after swimming is another risk, particularly on windy days. Regular swimmers often bring warm clothing or hot drinks to prevent rapid heat loss.

The most dangerous spot? The wall

One of the biggest hazards is the temptation to walk or pose on tidal pool walls. “They’re constantly wet and extremely slippery. I’ve seen people seriously injure themselves trying to get a photo.”

Even shoes marketed as ‘rock-safe’ offer limited protection. Flip-flops and smooth-soled footwear are particularly dangerous.

“If you want the photo, think twice,” warns Van der Westhuizen. “Or better yet, just enjoy the pool. The ocean changes every day. Read the conditions, check the tides, look for marine life and never assume today will be the same as yesterday.”

For more information, listen to Van der Westhuizen using the audio player below: