Beijing is the capital of the People's Republic of China and one of the country's most populous cities. It is located in northwest China and is surrounded by mountains to the north, which help keep out the dry winds from Mongolia.
Beijing has a population of over 20 million people, with only 13 million officially registered as residents, while the rest live with temporary certificates. Additionally, there are approximately 10 million migrant workers, often referred to as "black people" in local terminology.
The majority of Beijing's residents are of Chinese ethnicity, primarily Han Chinese, but the city is also home to many Mongols, Manchus, and Tibetans. Furthermore, there is a significant foreign population, with most expatriates residing in the affluent and densely populated northern and eastern neighborhoods of Beijing.