Columbia is the state capital and largest city in the U.S. state of South Carolina. Columbia is the county seat of Richland County, but a portion of the city extends into neighboring Lexington County. The city is the center of a metropolitan statistical area of 767,598, the largest within the state. The name Columbia was a poetic term for the Americas derived from Christopher Columbus. Located 13 miles (21 km) northwest of South Carolina’s geographic center, Columbia is the primary city of the Midlands region of South Carolina, which comprises several counties in the central portion of the state. The city lies at the confluence of two rivers, the Saluda and the Broad, which merge at Columbia to form the Congaree River. CNNMoney.com named Columbia as one of America’s 25 best places to retire, and US News & World Report ranked the city sixth on its 2009 America’s Best Affordable Places to Retire list.