Introduction to Rapeseed Lake: Rapeseed Lake is located in Yijin Town and Yutan Township, Songyang County. Most of it is in Songyang, across from Xizihu Town, Tongcheng City, and Luoling Town, Yixiu District. The Longmian River in the upper reaches of Rapeseed Lake gave birth to the father and son prime ministers of the court - Zhang Ying and Zhang Tingyu. The lake also gave birth to literary factions and literary giants such as the famous "Tongcheng School".