Qinhuangdao, which lies at the foot of Yanshan Hills on the coast of Bohai Sea in northeast Hehei Province, is a place of great strategic value. Since ancient times, it has been known as the gateway to the capital.

• 秦皇岛市在今河北省的东北部，背倚燕山，濒临渤海，地势险要，素有“京都锁钥”之称。