Leirhnjúkur

Leirhnjúkur is a volcanic ridge within the Krafla caldera system near Lake Mývatn, and one of the most geothermally active and visually dramatic landscapes in Iceland. Marked trails wind through fields of steaming fumaroles, sulphurous hot springs, and the still-warm lava flows from the Krafla Fires — a series of volcanic eruptions that occurred between 1975 and 1984.

The contrast of colourful minerals — oranges, yellows, and whites from sulphur and silica deposits — against the black and red lava and the steam rising from countless vents makes this one of the most otherworldly walking experiences in Iceland. The Víti explosion crater (a different Víti from the one near Askja) is also visible within the caldera.

Leirhnjúkur is reached via the paved road from Reykjahlíð towards the Krafla power station, accessible by regular car year-round. A car park and information boards are at the trailhead. The marked loop trail takes approximately 1.5–2 hours. Stay strictly on the paths — the ground around fumaroles can be thin and unstable. One of the most rewarding free half-day excursions from the Mývatn area.