Lake Havasu () is a large reservoir formed by Parker Dam on the Colorado River, on the border between San Bernardino County, California and Mohave County, Arizona, Arizona. Lake Havasu City sits on the Arizona (eastern) side of the lake with its Californian counterpart of Havasu Lake directly across the lake. The reservoir has an available capacity of 619,400 acre-feet (764,000,000 m3). The concrete arch dam was built by the United States Bureau of Reclamation between 1934 and 1938. The lake's primary purpose is to store water for pumping into two aqueducts. Prior to the dam construction, the area was home to the Mojave people. The lake was named (in 1939) after the Mojave word for blue. In the early 19th century, it was frequented by beaver trappers. Spaniards also began to mine the areas along the river.

Boulder City is a town in Clark County, Nevada, United States. It is approximately 26 miles (42 km) southeast of Las Vegas. As of the 2020 census, the population of Boulder City was 14,885. The town took its name from Boulder Canyon. Boulder City is one of only two places in Nevada that prohibits gambling, the other being the town of Panaca.

Henderson is a city in Clark County, Nevada, United States, about 16 miles (26 km) southeast of downtown Las Vegas. It is the second largest city in Nevada, after Las Vegas, with an estimated population of 320,189 in 2019. The city is part of the Las Vegas Valley. Henderson occupies the southeastern end of the valley, at an elevation of 1,864 feet (568 m). Henderson is known for its supply of magnesium during World War II. With the decline of magnesium production, the Nevada legislature approved a bill that gave Nevada's Colorado River Commission the authority to purchase the industrial plants, and Henderson was incorporated in 1953. Henderson is the location of Lake Las Vegas.

Las Vegas (; Spanish for "The Meadows"), often known simply as Vegas, is the 26th-most populous city in the United States, the most populous city in the state of Nevada, and the county seat of Clark County. The city anchors the Las Vegas Valley metropolitan area and is the largest city within the greater Mojave Desert. Las Vegas is an internationally renowned major resort city, known primarily for its gambling, shopping, fine dining, entertainment, and nightlife. The Las Vegas Valley as a whole serves as the leading financial, commercial, and cultural center for Nevada. The city bills itself as The Entertainment Capital of the World, and is famous for its mega casino-hotels and associated activities. It is a top three destination in the United States for business conventions and a global leader in the hospitality industry, claiming more AAA Five Diamond hotels than any other city in the world. Today, Las Vegas annually ranks as one of the world's most visited tourist destinations. The city's tolerance for numerous forms of adult entertainment earned it the title of "Sin City", and has made Las Vegas a popular setting for literature, films, television programs, and music videos. Las Vegas was settled in 1905 and officially incorporated in 1911. At the close of the 20th century, it was the most populated American city founded within that century (a similar distinction was earned by Chicago in the 19th century). Population growth has accelerated since the 1960s, and between 1990 and 2000 the population nearly doubled, increasing by 85.2%. Rapid growth has continued into the 21st century, and according to the United States Census Bureau, the city had 641,903 residents in 2020, with a metropolitan population of 2,227,053.As with most major metropolitan areas, the name of the primary city ("Las Vegas" in this case) is often used to describe areas beyond official city limits. In the case of Las Vegas, this especially applies to the areas on and near the Las Vegas Strip, which are actually located within the unincorporated communities of Paradise and Winchester.