The boundary of the transitional region between Qinling Mountains and Huanghuai Plain was divided first in this paper, then some features of physical geography in the transitional region were discussed. (1) The east boundary of the transitional region is at the contour about 100 m, and the west boundary is at the contour about 500 m. The area of the transitional region is about 26 000 km~2,which makes up 15.9% of total area in Henan Province.(2) The natural features in the transitional region possess trans...
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