Weifang is a prefecture-level city in central Shandong province, People's Republic of China. The city borders Dongying to the northwest, Zibo to the west, Linyi to the southwest, Rizhao to the south, Qingdao to the east, and looks out to the Laizhou Bay to the north. Its population was 9,386,705 at the 2020 census, of whom 3,095,520 lived in the built-up area made up of four urban districts and Changle County largely being urbanized.

Dongying, a prefecture-level city, lies on the northern coast of Shandong province, People's Republic of China. As of the 2020 census, 2,193,518 people resided within its administrative area of 7,923.26 km2 (3,059.19 sq mi) and 1,188,656 in the built-up area made up of Dongying and Kenli districts. Dongying is home to the Shengli Oilfield, which after the Daqing oilfield is the second largest oilfield in China.