Well In the USA it is either Snow Bird or Sun Valley
Depending on the time of year you visit, there are several attractions at Whistler Ski Resort! While the black diamond ski runs are the most popular during winter, the warmer months draw visitors to Whistler for the hiking and fishing.
In percentage of the pistes it's probably Chamonix.
It is the largest indoor ski resort but it is not nearly as big as most outdoor ski resorts.
Europe: blackAmerica: the symbol that that represent the most difficult ski runs is the black diamond
Sawkill Family Ski Center Kingston, NY
The Brekenridge Ski Resort, similar to most ski resorts, offers begginer and intermediate ski schools that children can take to learn how to ski on the slopes.
Bryce Resort is the Northern most ski resort in Virginia. View the link below for more information.
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.
Paradiski with 34.000 hectares.
Angel Fire Resort is a ski resort located in the Sangre de Cristo Mountains in New Mexico. This resort is one of the most favorable ski resorts in America. This resort is known for it's steep ski slopes.
The most famous ski resort in India is in a small town called Gulmarg, in the state of Jammu and Kashmir
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.