gullied and rolling loess area
Gullied Loess Hill Plateau
gullied rolling loess area
gullied rolling loess region
gullied rolling loss area
hilly and gullied area of Northern Shaanxi Provinc
hilly and gullied area of Northern Shaanxi Province
hilly gullied Loess Plateau
residuals of limited extent s of gullied loess area
semi-humid gullied rolling region