Plura (river)

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Plura
Plura H.JPG
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Location of the river
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Plura (river) (Norway)
Location
Country Norway
County Nordland
Municipalities Rana Municipality
Physical characteristics
Source Kallvatnet
 - location Rana, Norway
 - coordinates 66°14′23″N14°46′22″E / 66.23960°N 14.77283°E / 66.23960; 14.77283
 - elevation564 metres (1,850 ft)
Mouth Ranelva
 - location
Rana, Norway
 - coordinates
66°20′20″N14°19′26″E / 66.33879°N 14.3239°E / 66.33879; 14.3239 Coordinates: 66°20′20″N14°19′26″E / 66.33879°N 14.3239°E / 66.33879; 14.3239
 - elevation
19 metres (62 ft)
Length27 km (17 mi)
Basin size437 km2 (169 sq mi)
Basin features
River system Ranelva

Plura is a river in the municipality of Rana in Nordland county, Norway. The river begins at the lake Kallvatnet, flows through the Plurdalen valley, and ends up as a tributary to the river Ranelva, about 10 kilometres (6.2 mi) north of the town of Mo i Rana. The river is rich with salmon, trout, and Arctic char. The name comes from the Norwegian verb "prula" which means "boiling" or "seething". [1]

Rana, Norway Municipality in Nordland, Norway

Rana is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the town of Mo i Rana, which houses the National Library of Norway. Other population centers in Rana include Alterneset, Båsmoen, Dunderland, Eiteråga, Flostrand, Hauknes, Mæla, Myklebustad, Nevernes, Røssvoll, Selfors, Skonseng, Storforshei, Utskarpen, and Ytteren.

Nordland County (fylke) of Norway

Nordland is a county in Norway in the Northern Norway region, bordering Troms in the north, Trøndelag in the south, Norrbotten County in Sweden to the east, Västerbotten County to the southeast, and the Atlantic Ocean to the west. The county was formerly known as Nordlandene amt. The county administration is in Bodø. The remote Arctic island of Jan Mayen has been administered from Nordland since 1995.

Norway constitutional monarchy in Northern Europe

Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe whose territory comprises the western and northernmost portion of the Scandinavian Peninsula; the remote island of Jan Mayen and the archipelago of Svalbard are also part of the Kingdom of Norway. The Antarctic Peter I Island and the sub-Antarctic Bouvet Island are dependent territories and thus not considered part of the kingdom. Norway also lays claim to a section of Antarctica known as Queen Maud Land.

Contents

The Plura river flows both over and beneath the ground, and it has the longest subterranean flow in Norway at 3.8 kilometres (2.4 mi). Until 1964, Plura was a large river, washing limestone out of the mountain, creating several caves/tunnels down through the Plurdalen valley. Through the Pluragrotta cave, about 20,000 cubic metres (710,000 cu ft) of water passed each minute. The Kallvatnet dam made the river Plura almost dry, and the water in Pluragrotta cave became standing still like in a water seal.

Limestone Sedimentary rocks made of calcium carbonate

Limestone is a carbonate sedimentary rock that is often composed of the skeletal fragments of marine organisms such as coral, foraminifera, and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). A closely related rock is dolomite, which contains a high percentage of the mineral dolomite, CaMg(CO3)2. In fact, in old USGS publications, dolomite was referred to as magnesian limestone, a term now reserved for magnesium-deficient dolomites or magnesium-rich limestones.

Cave Natural underground space large enough for a human to enter

A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos, though strictly speaking a cave is exogene, meaning it is deeper than its opening is wide, and a rock shelter is endogene.

Kallvatnet lake in Rana, Norway

Kallvatnet (Norwegian) or Gaallajaevrie (Southern Sami) is a lake in the municipality of Rana in Nordland county, Norway. The 28.61-square-kilometre (11.05 sq mi) lake lies about 25 kilometres (16 mi) southeast of the villages of Skonseng and Røssvoll.

See also

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References

  1. Store norske leksikon. "Plura" (in Norwegian). Retrieved 2011-12-20.