发源于中国的湄公河在越南南部分为南北干流 ,北干流称为前江 ,南干流称为后江 ,最后两条干流又分成九条支流入海 ,故称九龙江。九龙江冲积而成的平原面积约３９６００平方公里 ,占越南全国总面积的１／８ ,人口约１６１０万 ,占全国总人口的２１ %。九龙江平原历史上生产落后 Originating in China, the Mekong River is divided into north and south main streams in southern Vietnam, northern front streams are called Qianjiang, south main streams are called Houjiang, and the last two main streams are divided into nine tributaries into the sea, so it is called Jiulongjiang. The alluvial plain in Jiulongjiang covers an area of ​​39,600 square kilometers, accounting for one-eighth of the total area of ​​Vietnam and a population of about 16.1 million, accounting for 21% of the total population. The history of the Jiulong River Plain lags behind