Salt Lake City Winter sports, such as skiing and snowboarding, are popular activities in the Wasatch Mountains east of Salt Lake City. Eight ski resorts lie within 50 miles (80 km) of the city. Alta, Brighton, Solitude, and Snowbird are located in Big and Little Cottonwood Canyons to the southeast, Deer Valley, The Canyons, and Park City Resort are located to the east, near the city of Park City in Summit County, and Sundance is located to the southeast in Utah County. The ski resorts see frequent storms that deposit light, dry snow due to a phenomenon known as the lake effect, where storms amplified by the warm waters of the Great Salt Lake precipitate in the Wasatch Mountains. The ski resorts in Utah are promoted as having the "Greatest Snow on Earth." Alta and Deer Valley only allow skiing, while the others allow both skiing and snowboarding.