Zahedan (Persian: زاهدان‎‎, also Romanized as Zāhedān, Zahidan, and Zaidān; also known as Zāhedān-e Yek; formerly known as Dowzdāb, Duzdāb, and Duzdāp and renamed Zahedan by Reza Shah Pahlavi in the late 1920s ) is a city in and the capital of Sistan and Baluchestan Province, Iran. At the 2006 census, its population was 552,706, in 109,488 families.