Bushehr or Bushire pronunciation (Persian: بوشهر; also Romanized as Būshehr, Bouchehr, Buschir, and Busehr; also Bandar Bushehr (Persian: بندر بوشهر), also Romanized as Bandar Būshehr and Bandar-e Būshehr; previously known as Beh Ardasher, Antiochia in Persis (Greek: Αντιόχεια της Περσίδος) and Bukht Ardashir, is the capital city of Bushehr Province, Iran. At the 2006 census, its population was 161,674, in 40,771 families. Bushehr lies in a vast plain running along the coastal region on the Persian Gulf coast of south-western Iran, it is built near the ancient port city of Rishahr/Reshire (Sassanian, Riv Ardasher). It was the chief seaport of the country and is the administrative centre of its province. Its location is about 1,218 kilometres (757 mi) south of Tehran. The local climate is humid. Bushehr was the main trade center of Iran in the past centuries. The city structures are traditional in style, modest in proportion and cost. Due to its lack of rail connection to the interior of the country and its shallow anchorage, it has lost its position as the primary port of Iran.