Located just north of Split in the foothills of the Dinara mountain range is Croatia’s famous Cetina River Spring, a karst spring that looks like a giant blue eye! Also known as the “Eye of the Earth,” the Cetina spring drops to depths of more than 492 feet (150 m), although no diver has been able to reach the bottom. The spring is the source of the 63-mile-long (101-km) Cetina River, with its clear cold water flowing all the way to Omis, leaving river rapids and spectacular waterfalls along its