Any of the over 180 000 lakes in Finland! Most of them with beautifully clean water, easy access and free for anyone to swim in. Better still, make friends with a Finn to get invited to a summer house, which usually are found by a lake and have a sauna to warm up in after a dip in the lake. Alternatively, hire a summer house or make use of public saunas, which are an inexpensive way to be introduced to one of the Finnish national institutions. These are open both in the summer and in the winter, when you can try ice hole swimming - if you are brave enough!
Why not try wild swimming in Tampere, a city located between two large lakes. You can find details about ice hole swimming and public saunas on www.talviuimarit.fi
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