Mount Keilir

The Perfect Cone

Mount Keilir is the most recognisable peak on the Reykjanes Peninsula — a near-perfect volcanic cone rising from the flat lava fields like a green-grey pyramid. At 379 metres, it is not particularly high, but its isolation and symmetry make it look far more imposing than its elevation suggests. From Reykjavik, it is visible on clear days as a distinctive pointed silhouette on the southwestern horizon.

The mountain is a hyaloclastite formation — built from volcanic material that erupted beneath a glacier during the last ice age. The cone shape was preserved because the surrounding lava fields are much younger and flatter, making Keilir stand alone in the landscape.

The Approach

The hike begins from a parking area near the road between Keflavik and Grindavik. The first section crosses flat lava field terrain — old, moss-covered lava with a well-worn path winding between the rocks. This section is easy walking but exposed to wind, which on the Reykjanes Peninsula can be significant.

After about 3 kilometres, the trail reaches the base of Keilir's cone. Here the character of the hike changes completely. The ground steepens sharply, and the surface transitions from solid lava to loose volcanic scree and gravel.

The Summit Push

The final 200 metres of elevation gain are the crux of the hike. The slope angle increases to roughly 30-35 degrees, and the ground is loose — two steps up, one step sliding back. There is no single path; hikers pick their own line up the scree slope. It is physically demanding but not technically difficult. Take your time, place your feet carefully, and use hiking poles if you have them.

The summit itself is a narrow ridge with space for only a few people at a time. The views are spectacular — 360 degrees of Reykjanes lava fields, the Atlantic Ocean, the Fagradalsfjall eruption area, and on a clear day, the Reykjavik skyline and Snaefellsjokull glacier in the distance.

Recent Volcanic Activity

Keilir gained renewed attention during the Fagradalsfjall eruption of 2021, when seismic activity in the area raised concerns that Keilir itself might erupt. It did not, but the eruptions in nearby Geldingadalir and Litli-Hrutur (2021-2023) transformed the landscape around the mountain. From the summit, the fresh black lava flows from these eruptions are clearly visible, a stark contrast to the green moss of the older terrain.

Getting There

From Reykjavik, drive south on Route 41 toward Keflavik airport. The trailhead is near Asbru (the former NATO base), approximately 40 minutes from the city. Parking is in a gravel area near the trail start. The approach is well signed. There are no facilities — bring all water and supplies.