Isfahan or Sepahan, historically rendered in English as Ispahan or Hispahan, is a city located about 340 km south of Tehran and is the capital of Isfahan Province and Iran's third largest city. Isfahan ceety haed a population o 1,583,609 an the Isfahan metropolitan aurie haed a population o 3,430,353 in the 2006 Census, the seicont maist populous metropolitan aurie in Iran efter Tehran.