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.
Jiulong County is located in western Sichuan Province, southeast of Ganzi Tibetan Autonomous Prefecture and southwest of Gongga Mountain. Jiulong County covers an area of 6770 square kilometers, has jurisdiction over 17 townships and one town, with a total population of 52000. In 2008, GDP reached 470 million yuan, local revenue was 98.73 million yuan, and the per capita income of farmers and herdsmen was 4963 yuan. Kowloon is located in the transitional zone between Panxi Plain and the Qinghai-Tibet Plateau, forming four major landforms: high mountains, extremely high mountains, mountains and river valleys, with high topography in the north and low in the south, great disparity in height, complex topography, abundant rainfall, sufficient sunshine, and a typical three-dimensional climate. There is a saying that "one mountain is divided into four seasons, ten miles is different from the sky". Kowloon is a county inhabited by 12 ethnic minorities, mainly Tibetan, Han and Yi, with Hui, Miao, Bai, Yao, Qiang, Tujia and other ethnic minorities.