A historical pass at the western terminus of the Great Wall in Gansu province; it was a strategic point on the Silk Road and is known for its well-preserved fortress.

mouth of a valley or ravine; entrance to a mountain pass

Mutianyu; a popular and well-preserved section of the Great Wall located approximately 70 kilometers northeast of central Beijing

Jiayuguan prefecture-level city in Gansu Province [[甘肃省|甘肅省|gan1 su4 sheng3]]

The military fort at the western end of the Great Wall, located in Gansu province and built during the Ming dynasty