The Xianggui Corridor (Hunan-Guanxi Corridor, 湘桂走廊) situated between Yuecheng and Haiyang Mountains has since always been the most important route from Central China to Guangxi, It is a valley which is high about to above sea level. Cuting through the Nanling Mountains, the Xianggui Corridor is the upper reaches of the Xiang and Li Rivers. The Left Branch of the upper Xiang River rises in the southwest of the Haiyang Mountains.