Dictionary explanation: 1. It refers to Yongjiang and Liujiang in Sichuan. "Historical Records of the River Canal Book": "Shu Shou ice chisel off the raft, breaking the harm of foam water, crossing the second river and Chengdu." Zhang Shoujie just quoted Yu's Yi Zhou Ji: "The two rivers are the Lijiang River and the two rivers are the Lijiang River." Jin Zuosi's "Shu Du Fu": "The double streams of the two rivers resist the heavy resistance of Emei." Tang Du Fu's poem "Heavy Rain": "Three days without pedestrians, two rivers roar."