Yunnan is a province of the People's Republic of China, located in the far southwest of the country.
It spans approximately 394,000 square kilometres (152,000 sq mi) and has a population of 45.7 million (2009).
Of the approximately 30,000 species of higher plants in China, Yunnan has perhaps 17,000 or more.
Yunnan's reserves of aluminium, lead, zinc and tin are the largest in China, and there are also major reserves of copper and nickel.
In the west, the altitude can vary from the mountain peaks to river valleys as much as 3,000 metres (9,800 ft).
Yunnan is rich in natural resources and has the largest diversity of plant life in China.
As with other parts of China's southwest, Japanese occupation in the north during World War II forced a migration of majority Han people into the region.Ethnic minorities in Yunnan account for about 34 percent of its total population.The capital of the province is Kunming, formerly also known as Yunnan. Yunnan is situated in a mountainous area, with high elevations in the northwest and low elevations in the southeast.Most of the population lives in the eastern part of the province.
The Han Empire first recorded diplomatic relations with the province at the end of the 2nd century BCE.
It became the seat of a Sino-Tibetan-speaking kingdom of Nanzhao in the 8th century CE.