The Reykjanes Peninsula became one of Earth's youngest volcanic landscapes on March 19, 2021, when a fissure opened near Fagradalsfjall and sent rivers of molten basalt across Geldingadalir valley.
After 800 years of dormancy, the peninsula's volcanic systems reawakened with a series of eruptions that continued intermittently through 2023, reshaping kilometres of coastline and leaving a terrain of hardened lava fields, steaming craters, and fractured rock that still radiates heat years later. The eruption site lies within the Reykjanes UNESCO Global Geopark, a 829-square-kilometre area defined by the Mid-Atlantic Ridge — the tectonic boundary where the Eurasian and North American plates pull apart at roughly two centimetres per year.
Walking the trails today means crossing terrain that did not exist five years ago. The paths wind through aa and pahoehoe lava formations — the former jagged and brittle, the latter rippled like frozen water — toward the Litli-Hrutur and Meradalir craters, where sulphur-stained vents still exhale gases and the ground remains warm enough to scorch bare skin. Guided volcano hikes on the Reykjanes Peninsula typically begin at designated parking areas along Route 427, where trailheads are marked but conditions can shift rapidly with weather, and local knowledge becomes essential for safe passage across unstable crust and hidden fissures.
The broader peninsula has been a testing ground for understanding Icelandic volcanism. Geologists mapped more than 30,000 earthquakes in the weeks before the 2021 eruption, tracking magma's ascent through seismic monitoring stations scattered across the region. The eruption itself was classified as effusive rather than explosive, producing fountains of lava that reached 200 metres at peak activity but posed minimal ash risk, allowing unprecedented public access to an active volcanic event. That accessibility transformed Geldingadalir into one of the most-visited natural sites in Iceland during 2021 and 2022, though the trails remain challenging and unforgiving for unprepared visitors.
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