Jökulsárlón 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 km (0.93 mi) away from the ocean's edge and covers an area of about 18 km2 (6.9 sq mi). In 2009 it was reported to be the deepest lake in Iceland, at over 248 m (814 ft), as glacial retreat extended its boundaries.
Jökulsárlón has been a setting for four Hollywood movies: A View to a Kill, Die Another Day, Lara Croft: Tomb Raider, and Batman Begins, as well as the reality TV series Amazing Race. In 1991, Iceland issued a postage stamp, with a face value of 26 kronur, depicting Jökulsárlón.
The tongue of the Breiðamerkurjökull glacier is a major attraction for tourists.