Jokulsarlon Glacier Lagoon, known as the "Crown Jewel of Iceland" and part of Vatnajokull National Park (see Gallery), is the deepest and most spectacular glacial lake in Iceland. It is formed naturally from melted glacial water and is constantly growing while large blocks of ice crumble from the ever-shrinking glacier. The lake is full of broken icebergs--streaked blue and black--floating with the tide, occasionally breaking apart in a loud crash. This makes the lagoon and nearby glacier tongue even more special, as they will look different each time you visit.