Road 37 is a road that connects Takestan to Khuzestan. Part of it is a part of Ahvaz-Tehran Highway. Tehran is the largest city in the Middle East and is the 16th most populated city in the world with a population of 8,429,807. Most Iranian industries are headquartered in Tehran, including the manufacturing of automobiles, electrical equipment, military weaponry, textiles, sugar, cement, and chemical products. Tehran is also a leading center for the sale of carpets and furniture. There is an oil refinery located south of the city. Road 33 is a road in Ardabil Province connecting Ardabil to Germi and Bileh Savar via Road 12 to Parsabad. Ardab l is one of the Azeri inhabited provinces located in the North-West Iran and its center is Ardabil. It is in the north-west of the country, bordering the Republic of Azerbaijan and the provinces of East Azarbaijan, Zanjan, and Gilan. Its center is the city of Ardabil.