![A-tourist-flying-a-drone-on-the-edge-of-Red-Lake,-the-biggest-doline-in-Europe](https://videocdn.cdnpk.net/videos/3cb303e9-d031-4a6b-8808-24d9bff40797/horizontal/thumbnails/small.jpg)
A tourist flying a drone on the edge of Red Lake, the biggest doline in Europe
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