![A-non-freezing-source-of-the-freshwater-during-the-winter---a-famous-blue-springs-natural-reserve-in-Poland](https://videocdn.cdnpk.net/videos/87440119-8906-4527-840e-f94571ffe87f/horizontal/thumbnails/small.jpg)
A non-freezing source of the freshwater during the winter - a famous blue springs natural reserve in Poland
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