The Rein da Maighels is one of the main tributaries of the Rhine (see Sources of the Rhine

Sources of the Rhine

Lake Toma in the Swiss Canton of Graubünden is generally regarded as the source of the Rhine. Its outflow is called Rein da Tuma and after a few kilometers, it forms the Vorderrhein . The course of this river is not particularly representative, after about two kilometers, its water is diverted...

) and is a tributary to the Rein da Curnera

Rein da Curnera

The Rein da Curnera is a right tributary of the Anterior Rhine and one of the main tributaries of the Rhine . It is fed from multiple sources and glaciers at the southern end of the valley. The river is about 8 kilometers long and flows north through the Val Curnera...

. The firm Kraftwerke Vorderrhein AG has built a hydropower

Hydropower

Hydropower, hydraulic power, hydrokinetic power or water power is power that is derived from the force or energy of falling water, which may be harnessed for useful purposes. Since ancient times, hydropower has been used for irrigation and the operation of various mechanical devices, such as...

 dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

 creating a reservoir, called the Lai da Curnera

Lai da Curnera

Lai da Curnera is a reservoir in the municipality of Tujetsch, in the Grisons, Switzerland. The reservoir is linked to Lai da Sontga Maria and Lai da Nalps in the neighboring valley...

, into which both rivers now flow.

The origin of the Rein da Maighels is the Maghels Glacier on the Piz Ravetsch near the point where the cantons of Graubünden

Graubünden

Graubünden or Grisons is the largest and easternmost canton of Switzerland. The canton shares borders with the cantons of Ticino, Uri, Glarus and St. Gallen and international borders with Italy, Austria and Liechtenstein...

, Ticino

Ticino

Canton Ticino or Ticino is the southernmost canton of Switzerland. Named after the Ticino river, it is the only canton in which Italian is the sole official language...

 and Uri

Úri

Úriis a village and commune in the comitatus of Pest in Hungary....

meet. From the glacier, the Rein da Maighels flows north, through the Val da Maighels, then east, through Val Platta between Piz Cavradi and Piz Piogn Crap, then into Val Curnera and into the Lai da Curnera reservoir.