Shiraz (; , Širaz, , ) is the sixth most populous city of Iran and the capital of Fars Province (Old Persian as Pârsâ). At the 2011 census, the population of the city was 1,460,665 and its built-up area with "Shahr-e Jadid-e Sadra" (Sadra New Town) was home to 1,500,644 inhabitants. Shiraz is located in the southwest of Iran on the "Roodkhaneye Khoshk" (The Dry River) seasonal river. It has a moderate climate and has been a regional trade center for over a thousand years. It is regarded as one of the oldest cities of ancient Persia.