Cetina River Spring or Izvor Cetine also Eye Of The Earth with People swimming and having picnic, Croatia

cetina river spring izvor cetine eye of the earth croatia people picnic tourists swimming summer dragons eye blue hole cetina dalmatia omis birdseye aerial topdown overhead holidaymakers relaxing locals establishing cold karst spring karst hydrological system birds eye perspective drone deep turquoise emerald lake underground drainage visually impressive hidden gem unique shape natural wonder lagoon water fresh crystalclear groundwater wellspring natural pool sinkhole landscape nature tourism