Lago di Lei is a reservoir in the Valle di Lei, powering the Hinterrhein storage power stations. The reservoir is almost entirely located in Italy, but the barrage was built on territory later assigned to Switzerland, while an equivalent territory north of the lake was assigned to Italy. The dam is operated by Kraftwerke Hinterrhein.
The waters of the lake are the only waters in Italian territory which end up in 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.
Address 23020, Italy
Coordinates 46°27'2.277" N 9°26'37.169" E