4、isinChina.AfteritleavesChinaandthehighaltitude,theMekongbecomeswide,brownandwarm.AsitentersSoutheastAsia,itspaceslows.Itmakeswidebendsormeandersthroughlowvalleystotheplainswherericegrows.Atlast,theriverdeltaenterstheSouthChinaSea. PART2ANIGHTINTHEMOUNTAINS A