Award-winning author and photographer Daniel Start has uncovered 150 of Britain's favourite swimming holes in his book Wild Swimming, and we've asked him to pick 10 of the best for handbag.com.
So jump in - once your skin's tingling, your blood's pumping, and there's a massive grin on your face, you'll forget chlorine ever existed.
Wild Swimming by Daniel Start (Punk Publishing), £14.95, available from Wild Swimming
This disused mine quarry in North Wales is filled with clear, blue water and appears like a cobalt jewel on the mountainside. It is in fact the copper in these quarries, which inhibits the growth of algae that gives the waters their ethereal azure hue, further deepened under a blue summer sky. Many divers come here to practise their deep-water skills, and a swim near the cliff face with goggles on can be a vertigo-inducing experience. Blue Lagoon, Moel-y-Faen, Llangollen