The most active volcano in Iceland.

Grímsvötn is another prominent volcano in Iceland located within the Vatnajökull National Park. It is one of the country's most active volcanoes and is known for its powerful and explosive eruptions. Grímsvötn is situated beneath the Vatnajökull glacier, the largest glacier in Europe.

The volcano is named after the nearby lake Grímsvötn, which translates to "Grímr's lakes" in Icelandic. Grímsvötn volcano is a subglacial volcano, meaning that it is located beneath the ice cap of Vatnajökull, with the lake sitting on top of the volcano.

Grímsvötn has a long history of eruptions, with recorded activity dating back to the 18th century. It is known for its periodic eruptions, which typically occur every few years or decades. The volcano's eruptions are often explosive, producing powerful ash plumes and volcanic ash clouds that can reach high altitudes.

Grímsvötn eruptions attract considerable attention both locally and internationally due to their potential impact on air travel. The volcanic ash released during eruptions can pose a threat to aviation, as it can damage aircraft engines and affect visibility. Consequently, airspace restrictions and flight cancellations may be implemented during periods of volcanic activity.