If most popular means most visitors it's Les 3 Vallées.
The Cervinia Ski Resort is located in Italy. It is located in the Italian Alps, and is approximately 2 hours away from Turin, Italy. It is a popular ski destination for Europeans.
The Alps.
Kitzbuhel, Austria. Kitzbuhel is considered the "Pearl of the Alps" and is the most famous holiday resort in the Austrian Tyrol.
There are thousands of ski resort in the Alps! Here you find a list of over 1000: http://en.wikipedia.org/wiki/List_of_ski_areas_and_resorts_in_Europe
There are a couple of popular ski slopes in Canada. Some of those ski slopes are located at the following resorts: Kicking Horse Resort, Fernie Alpine Resort, and Red Resort.
4 Vallées.
La Tania is part of Les 3 Vallées which is, counted by the numbers of visitors, the most popular ski resort in the world.
The Heavenly Ski Resort is located at lake Tahoe near the California and Nevada border. Heavenly Ski Resort is one of the most popular winter ski resorts in the United States.
well there is La Plagne in the alps?
If most popular means most visitors it's Les 3 Vallées.
Avoriaz resort is located in the Alps France territory. The Avoriaz resort is part of the commune of Morzine. Also the Avoriaz resort is part of the major ski sport resort Portes du Soleil.
If most popular means most visitors it's Les 3 Vallées.