大别山
The Taihang Mountains form the western side of the triangular North China Plain. The other two sides are the Pacific coast to the east and the Yangtze River to the southwest. The vertices of this triangle are Beijing to the north, Shanghai to the southeast, and Yichang to the southwest. This alluvial plain, fed by the Yellow and Yangtze Rivers, is one of the most heavily populated regions of China. The only mountains in the plain are the Taishan in Shandong and Dabie Mountains of Anhui.