Jokuldalur is the gateway to the highlands from the north-east. Accessible from June to September.

Askja Caldera (50 km2) in the Dyngjufjoll Mountains, on the northern side of the Vatnajökull National Park. The mountains emerged in eruptions under an Ice Age glacier cap. Askja itself was formed, for the most part, at the end of the Ice Age in a major ash eruption which caused the roof of the magma chamber at the heart of the central volcano to subside.
The caldera contains several volcanoes, including Víti (explosive volcanic crater). Water has accumulated in the crater, its temperature is variable – it is around 30°C on average. Víti is a popular bathing site, but if you intend taking a dip, please be aware that the sloping path is very slippery in wet weather.
Be mindful that you need a 4×4 vehicle to access Askja as there are some unabridged rivers to cross. This part of the country is only accessible for a few months of the year, mostly from June to September, depending on the weather and road conditions.