Krysuvik Geothermal Area

Where the Earth Breathes

The Krysuvik geothermal area, known locally as Seltun, is one of the most accessible high-temperature geothermal fields in Iceland. Located on the Reykjanes Peninsula roughly 40 minutes south of Reykjavik, it sits directly on the Mid-Atlantic Ridge where the North American and Eurasian tectonic plates are pulling apart. The result is a landscape of constant geological unrest: columns of steam rise from fumaroles, grey mud pots gurgle and pop, and the surrounding hillsides are painted in vivid bands of yellow, orange, red, and green by sulphur deposits and iron-rich minerals reacting with the geothermal heat below.

A Boardwalk Through Boiling Ground

A well-maintained wooden boardwalk leads visitors through the heart of the geothermal field, keeping a safe distance from the hottest vents while offering close-up views of the activity. Two elevated viewing platforms provide broader perspectives across the steaming terrain and out toward the surrounding volcanic landscape. Information panels along the route explain the geothermal processes at work and the history of the area. The entire loop takes roughly 20 to 30 minutes at a comfortable pace, though most visitors spend longer photographing the extraordinary colours and watching the mud pots in action.

Geological and Scientific Significance

Krysuvik has attracted scientific interest for well over a century. In 1845, German chemist Robert Bunsen visited the site and used his observations here to develop his influential thesis on sulphuric acid formation. The area is part of the Krysuvik volcanic system, which stretches across the Reykjanes Peninsula and includes several fissure swarms and crater rows. The high-temperature geothermal activity at Seltun is driven by magma sitting relatively close to the surface, heating groundwater that then escapes through cracks and vents. The same tectonic forces that created this geothermal field have produced a series of volcanic eruptions on the Reykjanes Peninsula since 2021, a reminder that this is among the most geologically active regions in Europe.

Practical Information

Seltun is reached via Route 42, a paved road that also passes the beautiful and somewhat eerie Lake Kleifarvatn. There is a large free car park at the site with toilet facilities. No booking is required and there is no admission charge. The boardwalk is suitable for visitors of all ages and fitness levels, though it can be slippery when wet or icy in winter. Sturdy shoes with good grip are recommended. The sulphur smell is noticeable but not overwhelming for most visitors.

Combining With Other Reykjanes Attractions

Krysuvik pairs naturally with other highlights on the Reykjanes Peninsula. Lake Kleifarvatn, just to the north, is a deep tectonic lake set amid dark lava fields that feels otherworldly in any weather. A short walk south from the Seltun car park leads to Graenavatn, a vivid green crater lake whose colour comes from a combination of geothermal minerals and algae. Further west, the Bridge Between Continents, the Gunnuhver hot springs, and the cliffs at Reykjanesviti lighthouse complete a full day exploring one of Iceland's most underrated regions.