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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.

Heilongjiang Province, referred to as "black", the provincial capital Harbin, is the northernmost and easternmost provincial administrative region in China, with a total area of 473000 square kilometers. The geomorphological feature of Heilongjiang Province is "five mountains, one water and one grass". The terrain is generally high in the northwest, north and southeast, and low in the northeast and southwest, which is composed of mountains, platforms, plains and water surfaces; the land spans the four major river systems of Heilongjiang, Wusuli River, Songhua River and Suifenhe, belonging to cold temperate and temperate continental monsoon climate. Heilongjiang Province, located in the hinterland of Northeast Asia, is an important passage from Asia and the Pacific to Russia and the European continent, and an important window for China to open along the border. As of August 2019, Heilongjiang Province had jurisdiction over 12 prefecture-level cities and 1 district; there were 54 municipal districts, 21 county-level cities, 45 counties,
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