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 kilometres away from the ocean’s edge and covers an area of about 18 km2 . It recently became the deepest lake in Iceland, at over 248 metres, as glacial retreat extended its boundaries. The size of the lake has increased fourfold since the 1970s. It is considered as one of the natural wonders of Iceland.
The first settlers arrived in Iceland around AD 870, when the edge of the tongue of Breiðamerkurjökull glacier was about 20 kilometres further north of its present location. During the Little Ice Age between 1600 and 1900, with cooler temperatures prevailing in these latitudes, the glacier had grown by up to about 1 kilometre from the coast at Jokulsá River, by about 1890. When the temperatures rose between 1920 and 1965, the Breiðamerkurjökull glacier tongue rapidly retreated, continually creating icebergs of varying size, thus creating a lagoon in its wake around 1934–35. The lake is about 248 metres deep where the glacier snout originally existed. Glacial moraines became exposed on both sides of the lake. In 1975, the lake was about 8 km2 in area and now it reportedly stands at 18 km2 at the edge of the glacier tongue.
Feel free to admire the abstract forms of ice in this region of Iceland.