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.
Tacheng: the county-level city under the jurisdiction of Tacheng area of Yili Prefecture, Xinjiang, is located in the northwest of Xinjiang Uygur Autonomous region and the Tacheng basin on the northwest edge of Junggar Basin, with a total area of 4356.6 square kilometers. It is bordered by the Republic of Kazakhstan in the northwest, Emin County in the east and Yumin County in the south. It is 530 kilometers to the east from Urumqi, the capital of the autonomous region, and only 12 kilometers to the west from the first-class national port, Baktu Port. It is one of the closest open cities in China to the border. Tower is referred to as "Tarbatai" (Mongolian marmot). Tacheng is the seat of the Tacheng Prefectural Committee of the Communist Party of China and the administrative office of Tacheng area. In 1984, the county was removed and the city was established. In 1992, it was listed as a further open city along the border by the State Council. In June 1992, with the approval of the State Council, the national border was established.