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.
Qingyuan, also known as "Fengcheng", is a prefecture-level city in Guangdong Province, located in the middle and upper reaches of the Beijiang River. As early as the Neolithic Age, ancestors thrived in this land and created a splendid prehistoric civilization. Qingyuan is located in the north-central part of Guangdong Province, bordering Shaoguan in the northeast, Zhaoqing in the southwest and Guangzhou and Foshan in the southeast. With a total area of 19200 square kilometers, it is the largest prefecture-level city in Guangdong Province, with jurisdiction over Qingcheng, Qingxin District 2 and Fogang, Yangshan, Liannan and Lianshan counties and two county-level cities in Yingde and Lianzhou, with a total registered population of about 4.1 million in 2018. Qingyuan is connected with the Pearl River Delta region with Guangzhou as the center. In history, the southern part of Qingyuan once belonged to the jurisdiction of Guangzhou for a long time. Qingyuan culture, like Guangfu cultural circle, has a deep relationship in history, geography and ethnic groups. Yes