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The Rein da Medel ((イタリア語:Reno di Medel); (ドイツ語:Medelser Rhein)) is the longest headwater of the Rhine. It is located in the Swiss cantons of Ticino and Graubünden and flows through the valleys Val Cadlimo and Val Medel. ''Rein da Medel'' is the local Sursilvan, (i.e. Romansh) name in Graubünden, which is commonly used to denote the Ticino part as well.〔For example, by cantonal and federal authorities〕 The most important places along the river are the villages ''Curaglia'' and ''Platta'' in the municipality of ''Medel''. == Course of the river == The headwaters of the Rein da Medel flow through the Val Cadlimo, a valley south of the main Alpine ridge in the municipality of Quinto in the Canton of Ticino. This is officially Italian-speaking territory; the Italian name of the river is . There are three almost equally strong source streams: * The southern spring stream flows through the ''Lago Scuro'' (2451m, between ''Punta Negra'' and ''Bassa del Lago Scuro'') * The central spring stream rises on the ''Botta di Cadlimo'' (2534m) and shortly thereafter flows through the ''Lago di Dentro'' * The northern spring stream rises beneath the ''Pizzo Curnera''. The northern spring stream is about 640 meters long. The southern and western spring streams are about 1,000 meters from the spring to the confluence at . About a kilometer after the confluence of these spring creeks, the Reno di Medel flows through the ''Lago dell'Isra'' (2322m). A gorge runs under the Gotthard Base Tunnel and marks the transition from the Val Medel to the Val Cadlimo. Just below the gorge opens out, a tributary flows in from the south, which comes down from the Passo dell'Uomo via the Val Termine valley. In this area, the Reno di Medel form the boundary between the municipalities of Quinto and Blenio. A few meters north of the inflow into the Lai da Sontga Maria reservoir (1908m), the boundary between Ticino and Graubünden is a straight line between Lukmanier Pass and Pizzo Scai, which ignores the local topography. In Graubünden, the river flows through the Sursilvan speaking part of the canton. The middle section of the river is called ''Froda''; the lower section is called ''Rein da Medel''. The name change takes place at the confluence of major tributary ''Rein da Cristallina''. The middle and lower sections of the river are in the Val Medel valley. Most of this section is in the municipality of Medel, except the uppermost bit is in Ticino and the last kilometer is in the municipality of Disentis/Muster. A small valley branches off to the south-east from the Val Medel towards the Lukmanier Pass. The entrance to this vallye is covered by the Lai da Sontga Maria reservoir. Numerous small tributaries flow into the Reno di Medel throughout the entire Val Medel. The last two kilometers are through a canyon named ''Las Ruinas'' ((ドイツ語:Medelserschlucht)), where the Reno di Medel flows into the Anterior Rhine at about 1075 m above sea level, just below the road bridge across the Anterior Rhine in the road to the Lukmanier Pass. 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「Rein da Medel」の詳細全文を読む スポンサード リンク
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