Aerial view of the Glacier Lagoon in Iceland. This lagoon is formed as a result of global warming. The surface is at sea level and sea water flows into the lagoon at high tide. Huge blocks of ice constantly break off the glacier, Breiðamerkurjökull, and large icebergs float on the lagoon. The lagoon is not very wide but it is up to 250 meters deep which makes it the deepest lake in Iceland.