堑山堙谷

Explanation: Refers to the digging valley. Also as a "mound valley cutting mountains." 　　Source: "Records of First Emperor of the mind": "Thirty-five years, with the exception Road, Road, the original nine, arrived in Yunyang, through it." 　　Examples: Chanyu Tadun western Liaoning, especially strong, as the thickness of the Yuan, Yuan Shang go of it, a few into the damage, Gongchu Lulong, ~ five hundred years. ★ Wei Li Yuan Road, "Waterways of Great Liao water"