Europe: blackAmerica: the symbol that that represent the most difficult ski runs is the black diamond
At least in Europe you wear the same clothes as you skiied in most often including the ski boots.
If most popular means most visitors it's Les 3 Vallées.
Ski runs at ski resorts vary wildly in width. Most resorts in the US Northeast tend to be narrower than out West (USA). I believe Europe also has very wide runs. The narrowest downhill runs are generally about 30 feet wide. Most average runs are about 100 feet wide. The resort will call some traversing trails a "run" and name them, some of them can be very narrow, 10 or 15 feet wide. At the wide end, there are runs that cover an entire mountside. The resort may divide it into different "runs" for naming purposes. The resorts like to "boost" the number of runs they can quote in their advertisements.
In percentage of the pistes it's probably Chamonix.
There are a number of resources that one can use to book luxury ski holidays in Europe. For example, Finest Holidays, Esmerald Luxury Chalets, and Premium Switzerland all provide information about luxury ski holidays in Europe.
Charles Leocha has written: 'Ski America and Canada' -- subject(s): Skis and skiing, Directories, Guidebooks, Ski resorts 'Myths, Legends and Tales of Europe for Travellers' 'Ski Snowboard Europe' 'Ski Snowboard America & Canada (Ski Snowboard America and Canada)'
Well In the USA it is either Snow Bird or Sun Valley
Canada: Whistler-Blackcomb, British Columbia Europe: Zermatt, Switzerland
Paradiski.
Ruka in Finland one of the longest ski reasons in the world. From first weeks of October right through until June, ski lifts in Ruka continuously operate.
Black diamonds are used to mark the most difficult runs on a ski hill.