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.
Tianmen, known as Jingling in ancient times, is a municipality of Hubei Province, an important member of Wuhan City Circle and the urban agglomeration in the middle reaches of the Yangtze River, and the main node cities in the Han River Basin, located in the middle of Hubei Province and the north of Jianghan Plain, reaching Dahongshan in the north, Hanjiang River in the south and Wuhan in the east. In the fourth year of Emperor Yongzheng of the Qing Dynasty (1726), Tianmen Mountain was named "Tianmen". In 1994, the State Council approved Tianmen City to be directly under the jurisdiction of Hubei Province. In 2018, the city's resident population was 1.2723 million. Tianmen is an important birthplace of world tea culture, the hometown of Lu Yu, the largest hometown of overseas Chinese in the interior, and the hometown of steamed vegetables in China. It is a national sanitary city and a national garden city. It ranks among the top 100 county economies in the country and has been rated as one of the top 100 county economies for 12 consecutive years.