Glomma
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Glomma, pronounced and written Glåma in northern regions of the river, is the longest river in Norway, 598 kilometers long. It collects water from fully 13% of Norway's area.
At its fullest length, the river runs from lake Aursunden near Røros in Sør-Trøndelag and runs into the Oslofjord at Fredrikstad.
The upper limit of valley farms is variable, but typically runs about 500 meters (1650 feet) in the Østerdal, slightly lower than in the Gudbrandsdal, which reflects the colder climate. The treeline, with a light birch forest, rises to about 900 meters (3000 feet) in the Østerdal. Above Røros the forest is restricted to the valley floor.
The upper river valleys of Norwegian rivers have distinctive names which are vestiges of earlier cultural distinctions such as building styles, traditional clothing or bunad and domestic crafts. The upper valley of the Glomma is the Østerdal (or East Valley).
References
Scandinavia; An Introductory Geography, by Brian Fullerton & Alan Williams, Praeger Publishers, 1972.
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