Grensdalur

Grensdalur is a volcanic cone within the Hengill volcanic system in southwestern Iceland. The cone rises to about 500 meters in elevation and sits within a larger volcanic region dotted with active geothermal fields and steaming vents.

The volcanic system took shape during the Pleistocene epoch and played a key role in shaping Iceland's geology. This region demonstrates the ongoing volcanic forces that have built and reshaped the island over millions of years.

Scientists and researchers regularly visit the volcanic site to study rock formations and gather data about Iceland's geological evolution.

The site sits about 45 kilometers from Reykjavik and is best explored on foot with local guides. The ground is volcanic and somewhat uneven, so sturdy footwear and careful footing are necessary.

The geothermal energy from below the surface feeds heat to the nearby town of Hveragerdi. Visible steam vents and warm water flows throughout the valley reveal how the volcano's inner heat continues to warm the region today.

GPS coordinates: 64.04649,-21.19063

Latest update: December 14, 2025 18:05