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.
Pinghu is a county-level city under the jurisdiction of Jiaxing City, Zhejiang Province, with geographical coordinates between 30 °35 °north latitude and 121 °16 'east longitude. The land area is 537 square kilometers, the sea area is 1086 square kilometers, the coastline is 27 kilometers long, and the cultivated land area is 470000 mu. In 2015, the resident population was 683800. Pinghu belongs to the outer margin of Jiangnan ancient land Hangzhou Bay sag is an alluvial plain. The territory is flat, with an average elevation of 2.8 meters, with a total of 4.89 square kilometers of 20 low hills and 11 islands and reefs along the southeast coast, and a large plain. Since 2019, it has been selected into the top 100 counties and cities with comprehensive strength in 2019. Selected into the top 100 counties and cities of new urbanization quality in 2019 and the whole country in 2019.