Found on coastlines all around the planet, man-made "sea pools" are expected to offer swimmers a safe space from the dangers of tough spots and strange streams. From Australia's 82-foot beachside Avalon Rock Pool to the "Mermaid Pool" in Cornwall, UK, they can give a peaceful saltwater desert garden against a landscape of crashing ocean waves.


For London-based essayist and outside swimming fan Chris Romer-Lee, whose new book features photographs of more than 60 thrilling sea pools, their charm isn't just smart — he winds up drawn to the sense of safety they give.

"The photos I particularly like are the ones (taken) on stormy days, where you really get the vibe of being upheld in nature," he told CNN in a video interview.

His book, which consolidates papers from originators and individual external swimmers, incorporates various pools from wherever the globe. It moreover dives into the design and history of sea pools, from the nineteenth century onwards.