Which city does Longkou City in Shandong belong to?

according to the query of Baidu map website, Longkou City in Shandong Province belongs to Yantai City. Longkou is a city with a long history of culture. 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, and it was named after Longkou Pier built in the twenty-first year of Hongwu in Ming Dynasty (1388). In 1986, with the approval of the State Council, Huangxian County was revoked and Longkou City was established.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, excellent tourist city in China, national sanitary city, national green model city, national garden city, national sustainable development experimental zone, national ecological protection and construction demonstration zone, and pilot county for scientific development transformation and upgrading of county economy in the province.