汾河
During the Sui and Tang dynasties, the part of Gujiao to the south of Fen River, the majority part of nowadays Gujiao, was part of Jiaocheng County and the minor part to the north of Fen River was part of Yangqu County. In the year 596 AD in Sui dynasty, the western part of Jinyang was separated to set up the county of Jiaocheng, and the county seat was in Gujiao. In 691 AD, the county seat of Jiaocheng was moved to Dalingzhuang, part of today's Jiaocheng County, in order to get easier access of the national roads of Sui dynasty. In 713 AD, the northern part of Jiaocheng County is separated to set up Luchuan County, with the county seat at Luyukou at today's Gujiao. In 714, the Luchuan county was removed, and divided by the Fen River, Gujiao was split between Jiaocheng County and Yangqu County ever after, for more than one thousand years.