Dagur eldfjalla 1. júní – veldu þinn uppáhalds “eldfjalla” jarðminjastað í Reykjanes Geopark

Arnarsetur - A monogenetic volcanic fissure (2 km) with scoria and spatter craters, rugged lava formations (20 sq. km), lava tubes and remains of human activities. The eruption was an integral part of Reykjanes Fires, a volcano-tectonic episode in 1210-1240.

Djúpavatn/Spákonuvatn/Arnarvatn - Three lakes in the hylaoclastite Ice Age ridges Vesturháls and Sveifluháls, containing groundwater. Djúpavatn is partly a crater lake, close to Djúpavatnsleið road, Spákonuvatn crater lake to the Sog-geosite and Arnarvatn to a marked path across Sveifluháls.

Eldborg við Geitahlíð - A prehistoric, volcanic fissure cuts into the slopes of Geitafell, a hylaoclastite table mountain. Out of five craters, made of scoria but chiefly of spatter, one is by far the highest, with a prominent lava channel branching off to the east.

Eldvörp - A 10-km-long row of scoria and spatter cones in off-set (en echelon) sections, with centrally placed geothermal features and a borehole. It dates from a volcano-tectonic episode in 1210-1240 (Reykjanes Fires). The lava flow covers 20 sq. km, with remains of human activities.

Grænadyngja/Trölladyngja - Steep hyaloclastite mountains west of Sog - geosite. Geothermal sites and younger volcanic fissures border them, associated with various lava flows, including Afstapahraun (aa type) close to the Keflavik Int. Airport main road.

Háleyjarbunga - A small, flat lava shield with a large, 20 to 25-m-deep crater. At least 9,000 years old, it was formed during a highly effusive lava eruption. The basalt-type is a primitive deep-mantle derived picrite that contains much of the green mineral olivine.

Hrútagjárdyngja - A lava shield, 6,000 to 6,500 years old, plus a lava flow, 80-100 sq. km, has a volume of at least 3 cu. km. Besides a large top carter, the upper part is cut by deep ravines, probably due to magma injections, causing the whole structure to inflate.

Kerlingabás - Seaside remains of three large tephra rings, 800 to 2,000 years old, topped by lava flows. The uppermost one originated at the Younger Stampar crater row during the Reykjanes Fires, like the youngest tephra layers. Dykes cut through the tephra banks.

Sandfellshæð - One of the largest lava shields of the Reykjanes peninsula. The lava flow area exceeds 100 sq. km. The crater is large but shallow. The eruption occurred about 14,000 years ago, when sea level was some 30 m lower than today.

Skálafell - A volcano formed in a few eruptions, 3,000 to 8,000 years ago. The top crater is a handsome scoria and spatter cone. Large normal faults close by mark the eastern borders of Reykjanes Volcanic System and the Southwestern volcanic rift zone.

Stampar - Two parallel volcanic fissures on Reykjanes. Both are lined with numerous craters. The older row is 1,800 to 2,000 years old. The younger one dates from the volcano-tectonic Reykjanes Fires in 1210–1240, plus a 4.6 sq. km lava flow.

Sundhnúksröð - A monogenetic crater row formed about 2,300 years ago. The lava flow entered the sea (where the town of Grindavík is today) and created a low-rise, rocky seashore with a lagoon where the present harbour was step-wise designed.

Sveifluháls - One of the largest multi-summit hyaloclastite ridges in the Geopark. It is interesting for its variety of hyaloclastite formations; layered tuff, breccia and pillow lava. The rocks bear witness to interaction between magma, glacier ice and water.

Þráinsskjöldur - A very large, flat lava shield, visible from the road to the Keflavik Int. Airport. The road cuts through its vast lava flow. It is of the pahoehoe lava-type, at least 130 sq. km (5,2 cu km) and dates about 14,000 years back.

Eldey - A-77-m-high island, of unknown age, made of layered palagonite tuff on top of the Reykjanes ridge, 15 km offshore, from a tephra eruption on this section of the Mid-Atlantic Ridge. The area is 0.3 sq. km, large enough for up to 18,000 gannet pairs to nest.

Festarfjall/Hraunsvík - A hyaloclastite mountain formed during a subglacial eruption, possibly during the Weichselian glaciation. Marine erosion has opened up a cross section of palagonite tuff, breccia, pillow lava and a feeder dyke; a silver necklace belonging to a giantess.

Keilir/Keilisbörn - A cone-shaped hyaloclastite mountain attached to a low ridge (Keilisbörn). The formation stems from an eruption beneath an Ice Age glacier. Keilir is an icon for the Reykjanes Peninsula due to its distinct shape, and an old navigation mark.

Valahnúkur/Valbjargargjá/Valahnúksmöl - The shoreline at Reykjanes where the Mid-Atlantic Ridge connects to Iceland. Valabjargargjá is the normal fault to the east and Valahnúkur an eroded hill (palagonite tuff, pillow lava and breccia). Valahnúkamöl is a beach berm, made of large boulders.

Þorbjarnarfell - A free-standing, hyaloclastite mountain north of Grindavik. It is split by fault lines that create a shallow valley (graben). A part is called "The Thieves´ Gap" (Þjófagjá), occupied by 15 thieves according to the legend.

Fagradalsfjall Eruption site - A young volcanic eruption site northeast of Grindavík, formed by the 2021–2023 eruptions. Fresh lava fields, craters and steaming ground reveal the active forces shaping Reykjanes, where magma reached the surface after centuries of volcanic quiet on the peninsula