Fen River
In Taiyuan, the Fen River valley area has fertile water resource; for this reason, the Fen area has become the economic center of Shanxi province. There are two valleys of the south region of further south. One of the valleys is the Fen River valley, it had led to the Yellow River. The second valley is the Su River, which was along the north edge of Zhongtiao Mountain; and it was forming another triangular basin. The Fen River valley offered different routes of communication in Wei River valley, that both routes were open to the either side of the Yellow River.