From Su Shi's (
苏轼) Song-dynasty poem 《
八月十五日看潮五绝》 (Watching the Tide on the Fifteenth of the Eighth Month). Line: 『
八月十八潮,
壮观天下无』— 'the eighteenth-day tide of the eighth month, a spectacle unmatched on earth.' It refers to the Qiantang River (
钱塘江) tidal bore near Hangzhou, which peaks around the 18th day of the 8th lunar month, still drawing huge crowds today.