From Su Shi's (
苏轼, Northern Song)
《饮湖上初晴后雨》:
水光潋滟晴方好,
山色空蒙雨亦奇。
欲把西湖比西子,
淡妆浓抹总相宜。 (Shimmering waters look fine in sun; misty mountains charm in rain. I’d compare West Lake to Lady Xi Shi - in light or heavy makeup, always beautiful.)
西子 =
西施, legendary beauty of ancient Yue - the comparison stuck, and West Lake is still nicknamed
西子湖.