MountTaihangandMountYantogetherformtheroofofthecentralChinaplain,forminganaturalbarriertoBeijing,TianjinandthecentralChinaplain.TheMountTaihangregioncovers110citiesandcountiesinBeijing,Hebei,HenanandShanxi,withanareaof12millionhectares.In1984,theChinesegovernmentapprovedanoverallplanwiththeMountTaihangAreaAfforestationProject,identifyingsomecountiesforthetrialintroductionofafforestationtoenhancetheafforestationproject,