Introduction to the source of the Fen River: The source of the Fen River is located about 1 km northwest of Dongzhai Town, Ningwu County. According to the "Book of Mountains and Seas": "The mountain that governs the river is where the Fen River comes out." Therefore, later generations believe that this is the Fen River. The source of the river. The source is a pond. The stone wall above the pond is engraved with four characters "Fenyuan Lingmarsh". There is a dragon head carved in the stone wall, and a clear spring spurts out from the dragon's mouth, flowing all year round. There is a temple near the source called Leiming Temple, which was built in the Ming Dynasty and later destroyed.