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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.

Pingan District is one of the two municipal districts of Haidong City, Qinghai Province. Pingan County, named after Ping an Station in 1979, was changed to Pingan District in February 2015. It was the capital of Haidong District from 1979 to 2013. After Haidong was relocated and established in 2013, it is still the temporary residence of Haidong City. Ping'an District is located in the east of Qinghai Province, in the hinterland of Haidong city center, at 101 °49km east longitude and 36 °15 north latitude & #39;, faces Ledu District of Haidong City in the east, Xining City and Huangzhong County in the west, Hualong County in the south and Huazhu County in the north. By 2014, it had jurisdiction over 3 towns and 5 ethnic townships, with a total area of 769 square kilometers and a total population of 127515, mainly Han nationality, as well as 17 ethnic minorities, including Hui, Tibetan and Turkish. 2013, Ping
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