Introduction to Songjian Lake: At the end of the Eastern Jin Dynasty and the Southern and Northern Dynasties, Emperor Wen of the Song Dynasty Liu Yilong came here on a hunting tour and saw that dozens of miles around were stained by waterlogging, so he decided to cure it. The lake was built in the 24th year of Yuanjia (448). Because it was ruled by Emperor Wen of the Song Dynasty, it was named "Song Jianhu". King Kang of the Song Dynasty was crossing this lake when he was crossing south. He dropped his sword in the water in a panic, so he changed "Jian" to "Jian". Although there is no research on this theory, "Jian" and "Jian" are homophonic, and the word "Jian" is different from "Jian". "The word is elegant, so it has been passed down to this day.