Baidu map website shows that Longkou City in Shandong Province belongs to Yantai City. Longkou is a city with a long cultural history. The history of Longkou can be traced back to the Xia Dynasty. Laiguo was established in the late Shang Dynasty, and Huangxian was established in the Qin Dynasty. It is one of the earliest county administrative units in China, named after Longkou Wharf, which was built in the 21st year of Hongwu in Ming Dynasty (1388). 1986, with the approval of the State Council, Huangxian County was revoked and Longkou City was established. Longkou has successively won many honors such as National Civilized City, China Excellent Tourist City, National Sanitary City, National Greening Model City, National Garden City, National Experimental Zone for Sustainable Development, National Demonstration Zone for Ecological Protection and Construction, and Pilot County for Transformation and Upgrading of County Economic Science Development in the whole province.