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.
Sixian, which belongs to Suzhou City, Anhui Province, is located in the northeast of Anhui Province, bordering Sihong in the east, Lingbi in the west, Wuhe and Guzhen in the south, and Suining and Suqian in the north-east. The total area is 1787 square kilometers. Sixian County has a long history and was established as early as the Xia Dynasty. It is one of the important birthplaces of Sizhou opera, a national intangible cultural heritage. There are natural and beautiful "Hongxiang eight scenery", the ancient battlefield of the Chu-Han struggle-Bawang City monuments and sites, Sui and Tang dynasties Grand Canal Tongji Canal sites and other historical sites. As of 2018, Sixian County has jurisdiction over 12 towns, 3 townships, and another development zone. The resident population is 851000, with a regional gross domestic product (GDP) of 20.894 billion yuan. In terms of sub-industries, the added value of the primary industry is 5.005 billion yuan, and the secondary industry is increasing.