Ruinaulta is a canyon created by the Vorderrhein

Vorderrhein

The Vorderrhein is one of the two sources of the Rhine. Its catchment area of is located predominantly in the Canton of Graubünden . The Vorderrhein is about long, thus more than 5% longer than the Hinterrhein...

 in the debris of the Flims Rockslide

Flims Rockslide

Flims Rockslide occurred some 10000 years ago. It is known as the biggest Landslide incident in the Alps and the biggest worldwide whose effects are still visible, moving some of rock, about 300 times that of the historic Swiss Goldau landslide. The town of Flims can be found at the line where...

 just upstream of its confluence with the Hinter Rhine at Reichenau, Eastern Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. It is sometimes known as the Rhine Canyon, or Swiss Grand Canyon (more for its size than any resemblance to the Grand Canyon

Grand Canyon

The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is largely contained within the Grand Canyon National Park, the 15th national park in the United States...

). Protected by cliffs several hundred metres high, the area is forested and a haven for wildlife. It is easily accessible only by the Ruinaulta line of Rhaetian Railways, and is a popular location for rafting

Rafting

Rafting or white water rafting is a challenging recreational outdoor activity using an inflatable raft to navigate a river or other bodies of water. This is usually done on white water or different degrees of rough water, in order to thrill and excite the raft passengers. The development of this...

.