In China, at least since the middle of Tang dynasty, the phrase mulberry fields is a metonymy for the land which was or will be covered by oceans.
[5] The idiom is given in four characters, each having its own meaning: 沧 "blue, dark green; cold"; 海 "sea, ocean; maritime"; 桑 "mulberry tree; surname"; 田 "field, arable land, cultivated".
[1]"Blue seas where once was mulberry fields" (Chinese: 渤澥桑田; pinyin: bóxièsāngtián) was written on the Records of the Grand Historian by Sima Qian.
Wolmai, Choon Hyang's mother, agreed, as long as Yi Doryung was willing to give a marriage letter secretly to them and promise to never leave her daughter.
Trải qua một cuộc bể dâu 𣦰戈𠬠局𣷭橷 How many harrowing events have occurred while mulberries cover the conquered sea!