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.
Hami, one of the four prefecture-level cities in Xinjiang Uygur Autonomous region, is based in Yizhou District. Located in the east of Xinjiang, it is the main road from Xinjiang to the mainland of China. It has been the throat of the Silk Road since ancient times. It is known as "Western region flap throat, Chinese Arch Guard" and "Xinjiang Portal". It is adjacent to Jiuquan City, Gansu Province in the east, Bayinguoleng Mongolia Autonomous Prefecture in the south, Turpan City and Changji Hui Autonomous Prefecture in the west, and Mongolia in the north. Laoyemiao Port is one of the important open ports for the development of border trade between Xinjiang and Mongolia. As of 2016, Hami has a vast territory, a small population (619700) and a relatively high level of urbanization, with jurisdiction over Yizhou District, Balikun Kazakh Autonomous County and Yiwu County. In 2013, Hami achieved a gross domestic product of 334.