• Bakersfield
  • TongLing

Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about 151 sq mi (390 km2) near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's population as of the 2020 census was 403,455, making it the 48th-most populous city in the United States of America and the 9th-most populous city in California. The Bakersfield–Delano Metropolitan Statistical Area, which includes all of Kern County, had a 2020 census population of 909,235, making it the 62nd-largest metropolitan area in the United States. The more built-up portion of the metro area that includes Bakersfield and areas immediately around the city, such as East Bakersfield, Oildale, and Rosedale, has a population of 523,994.

Bakersfield is a significant hub for both agriculture and energy production. Kern County is the most productive oil-producing county in California and the fourth-most productive agricultural county (by value) in the United States. Industries in and around Bakersfield include natural gas and other energy extraction, mining, petroleum refining, distribution, food processing, and corporate regional offices. The city is the birthplace of the country music genre known as the Bakersfield sound.

Tongling, a prefecture-level city in Anhui Province, is located in the south-central part of Anhui Province and the lower reaches of the Yangtze River, with Hefei to the north, Chizhou to the south, Wuhu to the east and Anqing to the west, with a total area of 3008 square kilometers. Tongling gets its name from copper and flourishes with copper. it is known as "the ancient copper capital of China and the contemporary copper base". The history of copper mining began in the Shang and Zhou dynasties, flourished in the Han and Tang dynasties, and lasted for more than 3500 years. The first furnace of copper water and the first copper ingot in New China came from Tongling. The first copper industrial base was built in Tongling, and the first copper stock was issued in Tongling. In 2018, Tongling had jurisdiction over three municipal districts and one county, with a resident population of 1.629 million, achieving a GDP of 122.24 billion yuan, of which
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