Editing Glomma (section)

==Geography==
[[File:Elverum januar 2006 025.jpg|thumb|left|The Glomma at [[Elverum (town)|Elverum]], during winter]]
[[File:Glomma meets tributary Vorma.JPG|thumb|left|The [[Vorma]], a major [[tributary]], flows into the Glomma just north of [[Årnes]]]]
At its fullest length, the river runs from the lake [[Aursunden]] in [[Røros Municipality]] in [[Trøndelag]] county and runs into the [[Oslofjord]] at the town of [[Fredrikstad (town)|Fredrikstad]] in [[Fredrikstad Municipality]] in [[Østfold]] county. Major tributaries include the [[Vorma]] River, which drains [[Mjøsa|Lake Mjøsa]], joining the Glomma River at [[Årnes]] in [[Nes Municipality (Akershus)|Nes Municipality]]. The large river [[Gudbrandsdalslågen|Lågen]] flows into Lake Mjøsa, draining the large [[Gudbrandsdalen]] valley and significantly increasing the Glomma's flow.<ref>{{cite book|title=Scandinavia: An Introductory Geography|first1=Brian|last1=Fullerton|first2=Alan F.|last2=Williams|publisher=Praeger Publishers|location=New York|year=1972}}</ref>

Because it flows through some of 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 the [[Glommadal|Glomma valley]] farms is variable, but typically runs about {{convert|500|m}} in [[Østerdalen]], slightly lower than in the Gudbrandsdalen, which reflects the colder climate. The treeline, with a light birch forest, rises to about {{convert|900|m|ft}} in Østerdalen. North of [[Røros (town)|Røros]], the forested areas are only on 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 [[Østerdalen]] ({{lit|the 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 [[Ex-clay|LECA building blocks]] widely used for in the construction of foundations in Norway.