Víðgelmir

Víðgelmir is a lava tube situated in Western Iceland in the Hallmundarhraun lava field, ca. 2 km. Southeast from Fljótstunga<ref>{{cite web

Iceland - Expeditioners are walking on top of a "pipe" formed when half molten lava "skin" rolled down the walls when the eruption receded.]] Víðgelmir has many ice-formations deep within the cave. Víðgelmir is a lava tube situated in Western Iceland in the Hallmundarhraun lava field, ca. 2 km. Southeast from Fljótstunga farm in Hvítársíða, Borgarfjörður. The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances. Viðgelmir is 1585m long, the largest part of the cave passage is 15.8m high and 16.5m wide making it by far the largest of its kind in Iceland. The cave has a wide entrance but narrows down in some places. An iron gate was installed at the first constriction in 1994 to preserve the delicate lava formations or speleothems which haven't already been destroyed. Evidence of human habitation, probably dating to the Viking age, has been discovered in the cave and is preserved in the National Museum of Iceland. Long stretches of the cave floor are very rough and shouldn't be navigated without a guide. Access and guided tours are provided at nearby Fljótstunga.

Lava tube caves are formed when a low-viscosity lava flow develops a continuous and hard crust which thickens and forms a roof above the molten lava stream. When the eruption subsides, the still molten lava moving beneath the crust will continue to drain downhill, leaving an open lava tube cave. Many other lava tube caves have been discovered in Hallmundarhraun (formed around 900 AD), most notable Surtshellir and Stefánshellir.

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is:Víðgelmir

<a href='http://en.wikipedia.org/wiki/Víðgelmir' target='_blank' rel='nofollow' style='font-size: 90%'>Text of this article is based on Wikipedia article «Víðgelmir»</a>

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