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.
Yuzhou City, referred to as "Jun", in ancient times known as "Xiayi", "Yangzhai", "Junzhou", Henan Province under the jurisdiction of county-level cities. Yuzhou City, with a total area of 1461 square kilometers and a central urban area of 114square kilometers, is located in the middle of Henan Province and is the central city on the southern edge of the Central Plains urban agglomeration. at the end of 2016, Yuzhou has a total population of 1.29 million and a resident population of 470000. Yuzhou is one of the birthplaces of the Chinese nation, the capital of the Xia Dynasty, the first slave dynasty in China, the only producing area of Jun porcelain, one of the five famous porcelain in China, and one of the four distribution centers of traditional Chinese medicine in the Ming and Qing dynasties. It is known as "Xia Capital", "Jun Capital" and "Medicine Capital". It was named as the first batch of famous historical and cultural cities in Henan Province in 2011 and the "hometown of Chinese Dayu Culture" in 2007.