Jökulsárlón (glacial river lagoon) is a large glacial lake in southeast Iceland, on the edge of Vatnajökull National Park. Situated at the head of the Breiðamerkurjökull glacier, it developed into a lake after the glacier started receding from the edge of the Atlantic Ocean. The lake has grown since then at varying rates because of melting of the glaciers. It is now 1.5 kilometres away from the ocean's edge and covers an area of about 18 km2. The blue icey water is filled with iceberg of various sizes that slowly drift down the lake an move towards the river mouth an on into the sea. The surf of the nearby beach of black lava sand is full of melting iceberg. The touristy boat tour on the lake in an amphibious vehicle is well worth it.