Vatnajökull

Where it sits. Vatnajökull covers the south-eastern quarter of Iceland's interior — around 7,700 square kilometres, close to eight per cent of the country — and is the largest ice cap in Europe by volume. Its average thickness is roughly 380 metres and its maximum around 950, so it holds more water than every other glacier on the European mainland combined. More than thirty outlet glaciers spill from it in all directions: Breiðamerkurjökull and Fjallsjökull towards the coast at Jökulsárlón, Skaftafellsjökull and Svínafellsjökull down into the Skaftafell valleys, Skeiðarárjökull onto its enormous outwash plain, Dyngjujökull north towards the Askja region. Beneath the ice sit some of Iceland's most active volcanoes, including Grímsvötn, Bárðarbunga and Öræfajökull, whose rim carries Hvannadalshnjúkur at 2,110 metres, the highest point in the country.

Fire under ice. The ice cap is a lid over a volcanic system, and the consequences are periodic and violent. Eruptions beneath the ice melt vast volumes of water that collect in subglacial lakes until they burst out as a jökulhlaup, a glacial outburst flood. The best documented modern example followed the Gjálp eruption of late 1996: on 5 November that year a flood surged across Skeiðarársandur at tens of thousands of cubic metres per second, destroying bridges on the Ring Road and dumping icebergs on the sand. Twisted bridge girders are kept beside Route 1 as a monument. Bárðarbunga's Holuhraun eruption of 2014 and 2015 produced the largest lava flow in Iceland since the eighteenth century, and Grímsvötn erupts on a roughly decadal rhythm. Against that, the ice is losing ground: the cap has thinned markedly since the late nineteenth century and its outlets retreat every year, which is measurable on the ground at Skaftafellsjökull, where markers show where the ice stood decade by decade.

On screen. Vatnajökull supplied the opening of A View to a Kill (1985), Roger Moore's final Bond film. The pre-title sequence, scripted as Siberia, has Bond recovering a microchip from the body of a fellow agent, outrunning armed pursuers on skis and escaping in a submarine disguised as an iceberg; it was filmed on the ice cap and at the lagoon at its southern edge. The glacier's other credits read like a catalogue of screen versions of "elsewhere": Batman Begins (2005) used the Svínafellsjökull outlet for its Himalayan ice, the second season of Game of Thrones filmed here in November 2011 for the lands beyond the Wall, and Christopher Nolan shot Mann's frozen planet in Interstellar on the same outlet glacier in 2013.

The national park. Vatnajökull National Park was created in 2008 by merging the older Skaftafell and Jökulsárgljúfur parks with the ice cap itself. At 14,967 square kilometres it takes in around fourteen per cent of Iceland and is among the largest protected areas in Europe. UNESCO inscribed it as a World Heritage Site on 5 July 2019, specifically for the interaction of ice, volcanism and running water. The park is administered in regions, each with its own visitor centre — Skaftafell in the south, Höfn in the east, Ásbyrgi in the north — and includes landscapes as different as Dettifoss, the Laki craters and the tuya of Herðubreið.

How people actually experience it. Nobody visits Vatnajökull as a single place; you visit an edge of it. Guided glacier walks run year-round on Falljökull and Skaftafellsjökull from the Skaftafell area, with crampons and a guide supplied. Snowmobile and super-jeep tours climb to the ice cap proper from Jöklasel above Skálafellsjökull, reached by a rough mountain road off Route 1 west of Höfn. Ice-cave tours run from roughly November to March, when meltwater channels inside the ice are frozen and stable enough to enter; caves are re-scouted every season because they collapse and re-form. Ski traverses of the cap and ascents of Hvannadalshnjúkur are serious multi-day undertakings requiring crevasse rescue skills.

Practical cautions and access. Unguided travel onto any outlet glacier is a genuinely bad idea: crevasses are often bridged by snow, the surface ice at the snout is undercut by meltwater, and rockfall from the moraine walls is constant in warm weather. Access to some outlets changes at short notice — Svínafellsjökull has been subject to access restrictions since 2018 after a large fracture was identified in the mountainside above it, with an associated landslide risk. Weather closures on the Ring Road are common in winter, and road and safety information is published daily by the Icelandic authorities.

Getting there and timing. The southern edge is reached from Route 1 between Kirkjubæjarklaustur and Höfn, about four and a half to six hours from Reykjavík; Höfn and Egilsstaðir have domestic airports. Winter delivers ice caves, aurora and the deepest blue in the ice; summer gives long light, glacier walking without darkness pressure and access to the highland approaches on the northern side.