Summerlin is a community in the Las Vegas Valley of Southern Nevada. It lies at the edge of the Spring Mountains and Red Rock Canyon to the west; it includes the census-designated place of Summerlin South, is partly within the official city limits of Las Vegas and partly within unincorporated Clark County. This community occupies over 22,500 acres and holds over 230 parks, more than two dozen public and private schools, 14 houses of worship, ten golf courses, three resort hotels, recreational facilities, retail and entertainment centers, well-established office parks, a medical center, and more.

The Las Vegas Valley is a major metropolitan area in the southern part of the U.S. state of Nevada, and the second largest in the Southwestern United States. The state's largest urban agglomeration, the Las Vegas Metropolitan Statistical Area is coextensive since 2003 with Clark County, Nevada. The Valley is largely defined by the Las Vegas Valley landform, a 600 sq mi (1,600 km2) basin area surrounded by mountains to the north, south, east and west of the metropolitan area. The Valley is home to the three largest incorporated cities in Nevada: Las Vegas, Henderson and North Las Vegas. Eleven unincorporated towns governed by the Clark County government are part of the Las Vegas Township and constitute the largest community in the state of Nevada.