Coronado, also known as Coronado Island, is an affluent resort city located in San Diego County, California, across San Diego Bay from downtown San Diego. Its population was 24,697 at the 2010 census, up from 24,100 at the 2000 census. Coronado lies on a peninsula connected to the mainland by a 10-mile (16 km) isthmus called the Silver Strand (locally, The Strand.) Locals sometimes call Coronado Nado or Coronado Island, and they denote the core living and business area as The Village. In May 2012, Dr. Stephen Leatherman, Director of the Laboratory for Coastal Research, ranked Coronado Beach as the best beach in the United States.