Phoenix is the capital and largest city of the U.S. state of Arizona, as well as the fifth most populated city in the United States. It is home to 1,601,587 people according to the 2009 estimate by the U.S. Census Bureau, and is the anchor of the Phoenix metropolitan area (also known as the Valley of the Sun), the 12th largest metro area by population in the United States with more than 4.3 million people. In addition, Phoenix is the county seat of Maricopa County, and is one of the largest cities in the United States by land area. Settled in 1867 as an agricultural community near the confluence of the Salt and Gila Rivers, it's well known for high-end spa resorts, Jack Nicklaus–designed golf courses and vibrant nightclubs. Other highlights include the Desert Botanical Garden, displaying cacti and numerous native plants.