Editing Glomma

{{Infobox river
| name               = Glomma / Glåma
| name_native        = 
| name_native_lang   = 
| name_other         = 
| name_etymology     = [[Old Norse]]: ''Glaumr'', from ''raumr'': "noise," "racket"
<!---------------------- IMAGE & MAP -->
| image              = lakelandscape800.jpg
| image_size         = 
| image_caption      = The Glomma at the [[Solbergfoss Hydroelectric Power Station]]
| map                = glomma_watershed.png
| map_size           = 
| map_caption        = Map of the Glomma River watershed
| pushpin_map        = 
| pushpin_map_size   = 
| pushpin_map_caption= 
<!---------------------- LOCATION -->
| subdivision_type1  = Country
| subdivision_name1  = [[Norway]]
| subdivision_type2  = 
| subdivision_name2  = 
| subdivision_type3  = 
| subdivision_name3  = 
| subdivision_type4  = 
| subdivision_name4  = 
| subdivision_type5  = 
| subdivision_name5  = 
<!---------------------- PHYSICAL CHARACTERISTICS -->
| length             = {{convert|621|km|mi|abbr=on}} 
| width_min          = 
| width_avg          = 
| width_max          = 
| depth_min          = 
| depth_avg          = 
| depth_max          = 
| discharge1_location= 
| discharge1_min     = 
| discharge1_avg     = {{convert|720|m3/s|cuft/s|abbr=on}}
| discharge1_max     = {{convert|4700|m3/s|cuft/s|abbr=on}}
<!---------------------- BASIN FEATURES -->
| source1            = [[Aursunden]]
| source1_location   = [[Røros Municipality]], [[Trøndelag]], [[Norway]]
| source1_coordinates= {{coord|62|37|06|N|11|48|11|E|display=inline}}
| source1_elevation  = {{convert|690|m|abbr=on}}
| mouth              = [[Fredrikstad (town)|Fredrikstad]]
| mouth_location     = [[Fredrikstad Municipality]], [[Østfold]], [[Norway]]
| mouth_coordinates  = {{coord|59|13|04|N|10|55|51|E|display=inline,title}}
| mouth_elevation    = {{convert|0|m|abbr=on}}
| progression        = 
| river_system       = 
| basin_size         = {{convert|42000|km2|abbr=on}}
| tributaries_left   = [[Vorma]]
| tributaries_right  = [[Renaelva|Rena]]
| custom_label       = Designation
| custom_data        = {{Designation list
| embed                = yes
| designation1         = Ramsar
| designation1_offname = Glomådeltaet
| designation1_date    = 12 November 2010
| designation1_number  = 1954<ref>{{Cite web|title=Glomådeltaet|website=[[Ramsar Convention|Ramsar]] Sites Information Service|url=https://rsis.ramsar.org/ris/1954|access-date=25 April 2018}}</ref>}}
| extra              = 
}}

The '''Glomma''' or '''Glåma'''<ref>{{Cite web |title=Informasjon om stadnamn |url=https://stadnamn.kartverket.no/fakta/426301 |access-date=2025-01-04|website=Norgeskart |publisher=[[Norwegian Mapping Authority|Kartverket]] |language=no}}</ref> is [[Norway]]'s longest and most voluminous [[river]]. With a total length of {{convert|621|km|mi|abbr=off}}, it has a [[drainage basin]] that covers 13% of Norway's surface area, all in the southern part of the country.<ref>{{Cite web|url=http://www.retten.no/lokale_nyheter/article6086600.ece|title=Til kilden|date=June 2012}}</ref>

==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.

==Name==
The form ''Glomma'' 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".<ref>Tolkien, Christopher (trans.), ''[http://vsnrweb-publications.org.uk/The%20Saga%20Of%20King%20Heidrek%20The%20Wise.pdf The Saga of King Heidrek the Wise]'' (London: Nelson, 1960), p. 67 fn. 4.</ref>

Several places are named after the river, for instance [[Glåmdal]] and [[Glåmos]].

==See also==
* [[:Category:Populated places on the Glomma River]]

==References==
{{reflist}}

==External links==
*{{commons category-inline|Glomma}}

{{Authority control}}

[[Category:Rivers of Akershus]]
[[Category:Rivers of Innlandet]]
[[Category:Rivers of Trøndelag]]
[[Category:Ramsar sites in Norway]]
[[Category:Rivers of Norway]]
[[Category:Rivers of Østfold]]