Longkou, formerly Huang County, is a port city in northeastern Shandong province, China, facing the Bohai Sea to the north and the Laizhou Bay to the west. Longkou, a county-level city, is administered by the prefecture-level city of Yantai. It 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, and 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.

Yantai, formerly known as Chefoo, is a coastal prefecture-level city on the Shandong Peninsula in northeastern Shandong province of People's Republic of China. Lying on the southern coast of the Bohai Strait, Yantai borders Qingdao on the southwest and Weihai on the east, with sea access to both the Bohai Sea and the Yellow Sea. It is the largest fishing seaport in Shandong. Its population was 6,968,202 during the 2010 census, of whom 2,227,733 lived in the built-up area made up of the 4 urban districts of Zhifu, Muping, Fushan and Laishan.