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Klarälven ("The clear river" in Swedish〔Page 168 of the Swedish Etymological Dictionary ''Svenskt ortnamnslexikon'', published 2003 by the institute of Språk- och folkminnesinstitutet, Uppsala. – The name ''Klarälven'' or ''Clara älv'' has been used since the beginning of the 18th century. Before that time the river had some other names, among them the most important name: ''Gautelfr'' i.e. Göta älv.〕) is a river flowing through Norway and Sweden. Together with Göta älv, which it is called as the river has passed through the lake Vänern, thus regarded as an entity, Göta älv-Klarälven is the longest river in Scandinavia and in the Nordic countries and its Swedish part the longest river of Sweden. These two rivers also have the largest drainage basin in the same areas, 50,229 km2 (included all the rivers that run into the lake Vänern), of which 42,468 km2 is located in Sweden, and the rest 7,761 in Norway.〔(Swedish Meteorological and Hydrological Institute (in Swedish) ) (Swedish Meteorological and Hydrological Institute).〕 It emanates from Lake Rogen in Härjedalen, Sweden, and then passes through the Norwegian Hedmark, where it flows through the lake Femunden. There it is known as Femundelva and Trysilelva (before the nationalistic movement in the 19th century the river was called Klara even in Norway; today it is called Femundelva in the municipality of Engerdal and Trysilelva in the municipality of Trysil, reflecting strong local patriotism in Norway). The rest of the river, the longest part, flows through Värmland to ultimately discharge in a delta into Vänern at Karlstad. In its turn, Vänern drains then into Göta älv, reaching the sea at Gothenburg. The river has historically provided significant economic benefits, providing a suitable transport route for log driving, and currently is internationally recognized as excellent sport fishing waters. ==Geography== The watershed of Klarälven is commonly referred to as Klarälvsdalen (''the Klarälv basin''), where it accumulates much of its water on its journey to Vänern. Other important sources of water are the snowy mountains in the northern areas of the watershed area, providing substantial flows in the spring when the snow melts; annual floods are common. Since the Ice Age, the mouth of Klarälven has moved from Forshaga to its current position at Karlstad,〔(History of Forshaga ) published by the Genealogy Society of Värmland〕 and is still moving, albeit for different reasons, as the river carries substantial quantities of sand, cut from the outer edges of its meandering curves, causing the shoreline of Vänern to constantly move southward. The heavy meandering of Klarälven results in numerous oxbow lakes, formed as a result of a too sharp curve, eventually causing the river to create a new, shorter path. An artificial islet, ''Gubbholmen'' found in central Karlstad has also been created as a result of the accumulation of 5000 tonnes sand transported each day during the spring flood.〔(Dubbskadeexkursion den 22 juni )〕 Entering the Karlstad region, the river delta splits into two main parts and eight smaller parts. The east part splits into two further main branches after passing Gubbholmen (eventually three branches). The west part splits into five branches. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Klarälven」の詳細全文を読む スポンサード リンク
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