Lac dien (English spelling)

Japanese: ラクディエン（英語表記）lac dien

Also written as 貉田. Rice fields irrigated by tidal action in the Song Khoi River (Red River) Delta of ancient Vietnam. According to the Jiaozhouji, cited in the Shuijingzhu by Li Daoyuan of the Northern Wei Dynasty, in northern Vietnam before it was conquered by the Han Dynasty, there were rice fields where the water level rose and fell with the tides, and these fields were called Luo fields, the people who cultivated them were called Luo people, and there was a ruling class called Luo General, Luo Hou, and Luo King (also called Xiong General, Xiong Hou, and Xiong King). This description suggests that advanced irrigation technology using sluice gates, such as the tidal irrigated rice fields in the southern part of the Song Khoi River Delta today, or the intake of ao (freshwater from a tidal river) in the Saga Plain, existed in the Song Khoi River Delta in the 2nd century BC, and that there was a ruling class that controlled this water resource.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

貉田とも表記される。古代ベトナムのソンコイ川(紅河)デルタにあった，潮汐作用によって灌漑される米田。北魏の酈道元（れきどうげん）の《水経注》が引用する《交州記》によれば，漢に征服される以前の北部ベトナムには，田面の水位が潮の満干により上下する水田があり，その田を雒田，耕作民を雒民といい，また雒将，雒侯，雒王(別に雄将，雄侯，雄王)という支配者層があったという。この記述により，現在のソンコイ川デルタ南部の潮汐灌漑田，あるいは佐賀平野の〈あお(感潮河川の逆流淡水)〉取水などのような，水門を使った高度の灌漑技術が，前2世紀のソンコイ川デルタに存在し，この水利を統括する支配者層があったとされた。

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