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Keilir is a hyaloclastite mountain.

It was created during subglacial eruptions during the ice age. It´s shape makes it distinctive and according to geologists, it probably is a crater plug. In spite of its steep slopes, it is not too difficult to climb, and the view from its top on a fine day is to be remembered. Keilir is the most distinctive landmark of Reykjanes and a symbol of the Reykjanes peninsula. On top of the mountain is a concrete table with a view direction map on a metal plate.

Location: 4x4 cars can drive on Höskuldarvegi and there is a parking at Oddafell and from there is a trail to Keilir. 

From Höskuldarvellir there is only 3 km walk to Keilir.