1900m. It takes 37 minutes to walk 1.9 km from Xizhimen overpass to the zoo, which is converted into 1.9 km (km)= 1900 m (m) according to the unit. Xizhimen overpass is located in the Second Ring Road, Xicheng District, Beijing. Xizhimen Bridge was built in 1999 with an investment of 200 million yuan. It is a famous overpass in Beijing, at the corner of the North Second Ring Road and the West Second Ring Road, and it is the only way for the urban area to reach the northwest suburb. Beijing Zoo is located in Xizhimenwai Street, Xicheng District, Beijing, adjacent to Beijing Exhibition Hall and Moscow Restaurant in the east, covering an area of about 86 hectares with a water surface of 8.6 hectares.