Yanmen Pass (雁門關) is the name of a Great Wall pass. It's located in Dai County, Xinzhou of Shanxi province in China. Yan means 'wild goose' in English, and was so-named because wild geese are seen flying around the pass every year. Early in the Spring and Autumn Period (770 BC - 476 BC), King Wuling of Zhao established Yanmen County in this region. The Tang Dynasty (618 - 907) built a pass called Xiting Pass by Yanmen Mountain, west of the present location. In the year 1374 during the Ming Dynasty (1368 - 1644), the pass was rebuilt and moved to today's location. Yanmen Pass is one of three important passes through the inner line of the Great Wall in the Shanxi section. Many famous historical battles have been fought in the area.
