Longkou City, a county-level city under the jurisdiction of Shandong Province and administered by Yantai City, is located in the northwest of Jiaodong Peninsula and the south bank of Bohai Bay, adjacent to Penglai District in the east, Qixia City and Zhaoyuan City in the south, Bohai Sea in the west and north, facing Tianjin and Dalian across the sea. With a total area of 901 square kilometers, the city has jurisdiction over 5 subdistricts, 8 towns and 1 high-tech industrial park. As of November 2020, Longkou has a permanent resident population of 729,800.

Longkou has won many honors, such as National Civilized City, China Excellent Tourism City, National Health City, National Green Model City, National Garden City, National Sustainable Development Experimental Zone, National Ecological Protection and Construction Demonstration Zone, and provincial pilot county for scientific economic development transformation and upgrading. Within the territory of the big Lailong Railway, Longyan railway and other railway trunk.

In 2021, the regional GDP and general public budget revenue of Longkou reached 123.66 billion yuan and 11.2 billion yuan respectively, with an annual growth rate of 6.7% and 5% respectively.