Þjórsárdalur
Þjórsárdalur () is a valley in Árnessýsla county in Iceland that lies between mount Búrfell (Þjórsárdal), Búrfell alongside the river Þjórsá to the east and mount Skriðufell to the west. The valley is quite flattened over and pumicey after repeated eruption of the nearby volcano Hekla as well as other volcanoes in the vicinity like the Vatnaöldur volcanic system which produced Iceland's biggest known lavafield Þjórsá Lava (Þjórsárhraun) in prehistoric times or the Grímsnes volcanic system with the crater Kerið. Landmarks in Þjórsárdal include Þjóðveldisbærinn Stöng, Gjáin, Háifoss, and Vegghamrar. Geography and Nature Þjórsárdalur valley is divided into two valley floors: Rauðukambar, Rauðukamba in the eastern part; and Bergólfsstaðaá (towards the river Sandá) in the west. On the inside of both valleys is the mountain Fossalda, and east of the river Fossá is Stangarfell. The next mountain towards the southwest is Skeljafell; after tha ...
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Hekla
Hekla (), or Hecla, is a stratovolcano in the south of Iceland with a height of . Hekla is one of Iceland's most active volcanoes; over 20 eruptions have occurred in and around the volcano since 874. During the Middle Ages, the Icelandic Norse called the volcano the "Gateway to Hell". Hekla is part of a volcanic ridge, long. The most active part of this ridge, a fissure about long named , is considered to be within Hekla proper. Hekla looks rather like an overturned boat, with its keel being a series of craters, two of which are generally the most active. The volcano's frequent large eruptions have covered much of Iceland with tephra, and these layers can be used to date eruptions of Iceland's other volcanoes. Approximately 10% of the tephra created in Iceland in the last thousand years has come from Hekla, amounting to 5 km3. Cumulatively, the volcano has produced one of the largest volumes of lava of any in the world in the last millennium, around 8 km3. Ety ...
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