Elevation:

งานของตัว, using

• Cohen, David J.; Murowchick, Robert E. (2014), "Early complex societies in Northern China", in Renfrew, Colin; Bahn, Paul, The Cambridge World Prehistory 2, Cambridge, UK: Cambridge University Press, pp. 782–806, ISBN 978-1-107-02378-9.
• Liu, Li (2005), The Chinese Neolithic: Trajectories to Early States, Cambridge University Press, ISBN 978-0-521-81184-2.
• Coastline, rivers and lakes from Natural Earth 1:10m Physical Vectors.
• Contours derived from 2-Minute Gridded Global Relief Data (ETOPO2) v2, NOAA National Centers for Environmental Information, using gdal_contour (from GDAL).