San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Liaocheng, a prefecture-level city of Shandong Province, is located in the west of Shandong Province, facing Zhangwei River and Handan City and Xingtai City of Hebei Province in the west, Jindi River in the south and southeast, Jining City, Tai'an City, Jinan City and Henan Province in the south and southeast, and Dezhou City in the north and northeast. It lies between 115o 16km east longitude and 116km east longitude and 37o 02m north latitude, 114km east-west and 138km north-south, with a total area of 8715 square kilometers. More than 6000 years ago, Liaocheng had the ancient city of Dawenkou culture, which successively created prehistoric culture, canal culture, red culture and so on. Liaocheng is a national historical and cultural city, with more than 2700 places of interest and historic sites and more than 470 scenic spots with tourism development value. National key cultural relics protection units