It has more than 310 ski areas with more than 600KM of skiing.
There is skiing for all comers. There are leaders in the 3 valleys, they are Val Thorens, Courcheval, Les Menuires,
Meribel-Mottaret. They are teamed with the smaller resorts of St. Martin, LaTania, Brides Les Baines.
There is also no need to get "lost" in the 3 Valees, as there are hundreds of shorter ski slopes thereabouts.
The 3 Valees also has lots of longer ones for more experiences skiers. To my knowledge Val Thorens is the highest.