Arnarsetur

Background

History & Background

Arnarsetur holds significant geological and ecological history. It is described as a 'gígaþyrping' or 'cluster of craters,' marking it as a key volcanic feature on the Reykjanes Peninsula. The youngest lava flow in this region originated from Arnarsetur, which itself is identified as a shield volcano. This indicates a relatively recent period of volcanic activity that shaped the immediate landscape. Beyond its geological importance, Arnarsetur boasts a fascinating natural heritage. Its name, meaning 'Eagle's Perch,' is rooted in historical observations. According to Bjarni Sæmundsson, a prominent Icelandic naturalist, eagles once nested at Arnarsetur. This suggests that the area, with its commanding views and rugged terrain, provided an ideal habitat for these majestic birds of prey, adding a layer of ecological significance to its volcanic origins. The site also served as an important resting place ('Áningastaður') for travelers, offering superb views ('gott útsýni') over the surrounding geomineral sites. The presence of the lava cave, Dollan, further highlights the area's unique geological makeup and its potential as a shelter or point of interest for centuries.

Arnarsetur formed during the later part of the Reykjanes Fires, the volcano-tectonic episode of 1210–1240. The roughly two-kilometre fissure contains scoria and spatter craters, while its rugged lava field covers about 20 square kilometres. Lava caves and traces of earlier human activity occur within the field. The place-name is linked to eagles that once nested in the area. Access is from Road 43 between Reykjanesbraut and Grindavík; stay on established tracks and protect fragile moss and lava formations.