Keilir was created during subglacial eruptions during the ice age. It´s cone- 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.