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.
Pingyuan County is located in the northwest of Shandong Province, belonging to Dezhou City, bordering Linyi County and Yucheng City in the east and southeast, Wucheng and Xiajin in the west and southwest, Gaotang in the south and Decheng and Lingcheng in the north. Pingyuan County is located in the northwest plain of Shandong Province in the lower reaches of the Yellow River, with flat terrain and slow tilt from southwest to northeast. The climate belongs to the continental monsoon climate of the north temperate zone, with four distinct seasons and sufficient sunshine. The administrative area covers an area of 1047 square kilometers, with a total population of 470000. It has jurisdiction over 8 towns, 2 townships, 2 streets and 1 economic development zone. Pingyuan County is the hometown of "grain production base", "Beijing-Tianjin vegetable park", "strong county of animal husbandry", "big county of live pigs", "hometown of pigeons", Zhang Quanjing, an expert in the history of party building, Ren Jiyu, the late master of Sinology, Deng Youmei, a famous writer, and so on.