Laozhanggou is located in Wuyuan County, Zhangjiakou City, Hebei Province, 200 kilometers southeast of Beijing, the mountains overlap, the valley is vertical and horizontal, there is a small stream in the center, there are a lot of springs next to the stream, is the source of the Baihe tributary Heihe, belonging to the Mongolian plateau to North China Charlotte Forest Transition Zone. Old palm ditch crossing is very famous, attracting many self-driving travelers every year.