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.
Qingtian County is located in the southeast of Zhejiang Province, in the middle and lower reaches of Oujiang River. It is bordered by Wenzhou, Yongjia, Nanlian and Wencheng to the east, Lishui and Jingning she Autonomous County to the west, and Jinyun to the north. The county covers a total area of 2493 square kilometers, which is known as "nine mountains, half water and half land". It is known as "the stone capital of China, Qingtian of the world". Qingtian has a long history and is known as "the hometown of stone carvings, the hometown of overseas Chinese and the hometown of celebrities". It is also the first county in house prices in China, the top ten financial counties in China, the first county in foreign exchange, and the first county in per capita deposits. Qingtian also has the world agricultural heritage-Qingtian rice-fish symbiosis system. Qingtian stone is the first of the four national stones, the stone of Nu Yi mends the sky, and the seal is the first of the three seals. In 2013, Qingtian deeply implemented the development strategy of "deepening radiation to Wenzhou, building Qingtian in the world, and building a happy hometown of overseas Chinese".