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.
Gaolan County, which belongs to Lanzhou City, Gansu Province, is located in the central part of Gansu Province, between longitude 103 °32'- 104 °14 °E and latitude 36 °05'- 36 °51'N, with a total area of 2136 square kilometers. Gaolan County has a temperate semi-arid climate with an average annual temperature of 7.2℃. As of 2018, Gaolan County has jurisdiction over 6 towns, and the county government is stationed in Shidong Town. By the end of 2017, the total registered population of Gaolan County was 147300. In the Western Han Dynasty, it belonged to Jincheng County and first bought Jincheng County. In the third year of Qianlong in the Qing Dynasty (1738), it was renamed Gaolan County because of Gaolan Mountain. In April 1970, Gaolan County was reclassified under the jurisdiction of Lanzhou City. Gaolan County has Dongguo pear, soft pear, Bailan melon, red sand potato, black melon seeds and other specialties. Tourist attractions include Guli Garden, Shidong Temple and Ling in Shichuan Town.