The wash pool, also known as "Dianchi Lake", "Ink Pool", "Goose Pool", "Zebi Pool", is located at No. 20 Dianchi Street, Linyi City, Shandong Province, in Wang Qianzhi's former residence, as the national key cultural relics protection unit; the Jin Dynasty Wang Qianzhi represented the Yi Wang clan once here "Linchi learning book" caused "the pool water is completely black".