Question: What census-designated place straddles Gallatin and Madison counties, and was home to the Moonlight Basin ski resort?

Context paragraphs:
Yellowstone Club: The Yellowstone Club, also Yellowstone Ski Resort, is a private residential club, ski resort, and golf resort located in the state of Montana, USA.  The Rocky Mountain ski and golf club is located in eastern Madison County, just west of Big Sky, Montana, south of Bozeman and northwest of Yellowstone National Park.

Geneva Basin Ski Area: Geneva Basin Ski Area (originally Indianhead Ski Area) opened in 1963.  Geneva Basin was developed by an Illinois family after their Indianhead Ski Area in Michigan, (now Indianhead Mountain Resort).  Indianhead closed in 1965 and the property was auctioned off to former Colorado Governor Roy Romer and the Burk Family.  In 1974 they sold it to an investment group from Kansas who enlarged the number of runs and lifts.  It closed again in 1984.  A few attempts were made to reopen the area.  Lack of snowfall during this time, along with insufficient funds, made this mostly wishful thinking.

Moonlight Basin: Moonlight Basin was a ski resort in southwestern Montana, located in the Madison Range of the Rocky Mountains in the resort village of Big Sky.  In October 2013, it, along with ski terrain within the Club at Spanish Peaks, were consolidated into Big Sky Resort, making Big Sky the largest single ski resort in the United States, with 5,750 acres (2,330 ha) of terrain and over 30 ski lifts.

Hogadon Ski Area: Hogadon Basin Ski Area is a ski resort located 11 mi south of Casper, Wyoming on Casper Mountain.  The mountain features 27 trails of varying difficulty.  Of those trails, 20% are beginner, 40% are intermediate and 40% are expert ski terrain.  The mountain also features a terrain park.  With 600 vertical feet from top to bottom .  The ski area offers a restaurant as well.  Hogadon is one of the few resorts in the country that has the actual resort building located on the summit as opposed to the base.

Powder Mountain: Powder Mountain is a ski resort located just east of Eden, Utah, stretching between Weber and Cache counties, and only 55 miles from Salt Lake City International Airport.  With over 7,900 acres of skiable terrain, 144 runs, snowcat skiing, side country skiing, backcountry tours and two terrain parks, Powder Mountain is the largest ski resort in the US by skiable acreage.  Powder Mountain consistently tops "Ski Magazine’s" “Best Value Resort” category, taking home the honor five out of the past six years.  With more than 300 inches of annual snowfall, Powder Mountain was ranked #2 for “Snow” and #4 for “Character” while also ranking 9th best by readers for Overall Satisfaction in 2012.

Shawnee Land, Virginia: Shawnee Land is a planned community in Frederick County, Virginia, United States.  Shawnee Land is located on the eastern slopes of Great North Mountain.  The Census Bureau defines it as a census-designated place (listed as Shawneeland) with a population of 1,873 as of 2010.  In its past, Shawnee Land was a ski resort with a number of slopes located on the eastern side of Great North Mountain.  Shawnee Land thrived for a few years, but eventually the investors abandoned the project and the ski slopes were closed due to the proximity of the bigger, nearby, Bryce Mountain Ski Resort.

Vail Ski Resort: Vail Ski Resort is located in Eagle County, Colorado, next to the town of Vail.  At 5289 acre , it is the 3rd largest single mountain ski resort in the United States behind Big Sky and Park City, featuring seven bowls and intermediate gladed terrain in Blue Sky Basin.  It opened in 1962 and is currently owned and operated by Vail Resorts, which also operates three other ski resorts in the state (Breckenridge, Keystone, and Beaver Creek), Heavenly Ski Resort, Northstar at Tahoe, and Kirkwood Mountain Resort at Lake Tahoe, and Park City Mountain Resort in Park City, Utah.

Big Sky, Montana: Big Sky is a census-designated place (CDP) in Gallatin and Madison counties in southwestern Montana.  As of the 2010 census it had a population of 2,308.  It is 45 mi southwest of Bozeman.  This unincorporated community straddles the two counties, is not considered a town, and has no town government.  The primary industry of the area is tourism.

Government Camp, Oregon: Government Camp is an unincorporated community and census-designated place located in Clackamas County, Oregon, United States, south of Mount Hood and north of Tom Dick and Harry Mountain.  It is the only town within 5 mi of Mount Hood and therefore is the "de facto" "mountain town".  It is a gateway to several ski resorts, the most popular being Timberline Lodge and Mount Hood Skibowl.  Government Camp also has its own, smaller ski resort, Summit Ski Area.  Somewhat farther east there is another very popular resort, Mount Hood Meadows.

Skiing in Lebanon: Skiing in Lebanon has been a popular sport since an engineering student returning from studying in Switzerland brought back with him the sport of skiing to Lebanon in the early twentieth century.  Lebanon is home to six developed ski resorts.  Cedars Ski Resort is the oldest and received its first ski lift.  Mzaar Ski Resort, formerly Faraya Mzaar, is Lebanon's largest ski resort.

Supporting paragraphs: Moonlight Basin Big Sky, Montana
Answer: Big Sky