The Glomma , or Glåma , is Norway 's longest and most voluminous river . With a total length of 621 kilometres (386 miles), it has a drainage basin that covers fully 13% of Norway's surface area, all in the southern part of the country.
7-755: At its fullest length, the river runs from Aursund lake near Røros in Trøndelag and runs into the Oslofjord at Fredrikstad . Major tributaries include the Vorma River, which drains Lake Mjøsa , joining the Glomma River at Årnes in Nes . The Lågen drains into Lake Mjøsa, collecting drainage from the large Gudbrandsdalen and significantly increasing the Glomma's flow. Because it flows through some of
14-602: Is used in Østfold and Akershus counties, while in Innlandet and Trøndelag counties the river is called (and written) Glåma . An older form was Glaumr ; another, in Old Norse , was Raumelfr , meaning a "loud noise" or "thunder" + "river". Several places are named after the river, for instance Glåmdal and Glåmos . Aursund Aursunden or Aursund is a lake in the municipality of Røros in Trøndelag county, Norway . The village of Brekken lies along
21-678: The Glomma valley farms is variable, but typically runs about 500 metres (1,600 ft) in Østerdalen , slightly lower than in the Gudbrandsdalen, which reflects the colder climate. The treeline, with a light birch forest, rises to about 900 metres (3,000 ft) in Østerdalen. 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
28-520: The Glomma is the Østerdal (or East Valley). Upon entering Lake Øyeren at Fetsund , the Glomma has formed Europe's largest inland delta which reaches the opposite side of the lake, across its short axis. Some of the vast amount of silt that the Glomma deposits in Lake Øyeren is extracted to manufacture LECA building blocks widely used for in the construction of foundations in Norway. The form Glomma
35-427: The eastern shore and the village of Glåmos lies along the western shore. There are several inflows to the 46-square-kilometre (18 sq mi) lake including the lakes Rien , Riasten , and Bolagen . The outflow is regulated by a hydropower dam through which water passes into the river Glomma . The lake is about 22 kilometres (14 mi) long and about 5 kilometres (3.1 mi) wide. The deepest part of
42-521: The lake reaches a depth of 52 metres (171 ft). Aursunden is often cited as the source of the river Glomma , the longest and largest river in Norway . The actual headwaters are near Aursunden near the start of the Glommadal valley. The locals claim that the headwater of the Glomma river is Mustjønna, a tiny lake about 30 kilometres (19 mi) north of Aursunden. This article related to
49-424: The richest forest districts, it has historically been Norway's leading log-floating river. The combination of raw materials, water power, and easy transport has over the centuries encouraged industry along the Glomma. Some of the country's largest manufacturing and processing concerns are found around its mouth, where supplies of timber and hydropower have been backed by excellent port facilities. The upper limit of
#567432