Lago di Lei | |
---|---|
Location | Lombardy (IT), Grisons (CH) |
Coordinates | 46°28′59″N9°27′18″E / 46.483°N 9.455°E |
Type | hydroelectric reservoir |
Primary outflows | Reno di Lei |
Catchment area | 46.5 km2 (18.0 sq mi) |
Basin countries | Italy, Switzerland |
Max. length | 7.7 km (4.8 mi) |
Surface area | 4.12 km2 (1.59 sq mi) |
Max. depth | 133 m (436 ft) |
Water volume | 197 million cubic metres (160,000 acre⋅ft) |
Surface elevation | 1,931 m (6,335 ft) |
Lago di Lei is a reservoir in the Valle di Lei, powering the Hinterrhein storage power stations. The reservoir is almost entirely in Italy, but the barrage was built on territory ceded by Italy to Switzerland (municipality of Ferrera, Grisons) in 1955 after diplomatic talks, while an equivalent sized territory further north of the lake was ceded to Italy in the exchange. [1] The dam is operated by Kraftwerke Hinterrhein. The waters of the lake are the only waters in Italian territory that drain to the North Sea, being part of the Rhine's drainage basin. Other waters of Italy that do not flow to the Mediterranean Sea are found in the valley of Livigno, valley of Sexten, Puster Valley east of Innichen, and most of the waters of the municipality of Tarvisio east of Sella Nevea: all these waters flow to the Black Sea through the basin of the Danube.
The geography of Italy includes the description of all the physical geographical elements of Italy. Italy, whose territory largely coincides with the homonymous geographical region, is located in southern Europe and comprises the long, boot-shaped Italian Peninsula crossed by the Apennines, the southern side of Alps, the large plain of the Po Valley and some islands including Sicily and Sardinia. Italy is part of the Northern Hemisphere. Two of the Pelagie Islands are located on the African continent.
The Rhine is one of the major European rivers. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein, Swiss-Austrian, and Swiss-German borders. After that the Rhine defines much of the Franco-German border, after which it flows in a mostly northerly direction through the German Rhineland. Finally in Germany, the Rhine turns into a predominantly westerly direction and flows into the Netherlands where it eventually empties into the North Sea. It drains an area of 9,973 sq km and its name derives from the Celtic Rēnos. There are also two German states named after the river, North Rhine-Westphalia and Rhineland-Palatinate.
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The Melezza, in Italy the Melezzo Orientale, is a 42 km Alpine torrent which runs through the eastern part of the Val Vigezzo, in the Province of Verbano Cusio Ossola, northern Italy; and through the Centovalli of Canton Ticino, Switzerland. Belonging to the Po basin, it is a tributary of the Maggia which in its turn flows into Lago Maggiore.
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The Rein da Medel 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, name in Graubünden, which is commonly used to denote the ticinese part as well.
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The border between the modern states of Switzerland and Italy extends for 744 kilometres (462 mi), from the French-Swiss-Italian tripoint at Mont Dolent in the west to the Austrian-Swiss-Italian tripoint near Piz Lad in the east. Much of the border runs across the High Alps, rising above 4,600 metres (15,100 ft) as it passes east of Dufourspitze, but it also descends to the lowest point in Switzerland as it passes Lago Maggiore at below 200 metres (660 ft).