![People-swimming,-jumping-into-cold-water-of-Cetina-River-Spring-,-also-known-as-Eye-Of-The-Earth,-a-karst-spring-and-deep-blue-Hole,-Croatia](https://videocdn.cdnpk.net/videos/9950d3da-afea-45fa-8a7b-80925753624a/horizontal/thumbnails/small.jpg)
People swimming, jumping into cold water of Cetina River Spring , also known as Eye Of The Earth, a karst spring and deep blue Hole, Croatia
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