Gengma Dai and Wa Autonomous County (Gengma County), under the jurisdiction of Lincang City, Yunnan Province, spans 98 ° 48 '- 99 ° 54' east longitude and 23 ° 20 '- 24 ° 02' north latitude. Gengma Town, the county seat, is located in the middle of the county, with a maximum horizontal distance of 112 kilometers from Kunming, the capital of Yunnan Province, to the northeast, and a maximum vertical distance of 76 kilometers from the north to the south. It is located in the southwest border of China, connected with mountains and waters of Myanmar, with a border line of 47.35 kilometers. It is the most convenient land passage from Lincang and Kunming to Yangon, Myanmar, and the Kyaukpyu Port on the Myanmar coast of the Indian Ocean. It is 15 kilometers and 24 kilometers from the border Qingshui River to the key towns of Myanmar, Hopang and Kunlong, respectively, 161 kilometers to Lashio, an important commodity distribution center in northern Myanmar, and 1162 kilometers to Yangon, Myanmar. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent population of Gengma Dai and Wa Autonomous County was 285683.

Gengma Dai and Wa Autonomous County, founded on October 16, 1955, is one of 29 ethnic minority autonomous counties and 25 border counties in Yunnan Province. With a land area of 3837 square kilometers, it has jurisdiction over 9 townships (towns), 2 farms, 1 overseas Chinese administrative area, 80 villagers committees and 12 communities, of which Mengding Town is a sub-county town and a national Class I open port.

Gengma Dai and Wa Autonomous County has Gengma Nanting River Provincial Scenic Spot, Lancang River Basin Nature Reserve, Shifo Cave Neolithic Cultural Site, Mengding Cave Scenic Buddha Temple, etc. Dunsha Festival is an annual traditional festival for the Gengma Dai people to say goodbye to the old and welcome the new. On April 30, 2019, the Yunnan Provincial People's Government decided to withdraw Gengma Dai and Wa Autonomous County from the poverty-stricken county sequence.

In 2020, the GDP of Gengma County was 12.147 billion yuan, up 4.4% year on year. In terms of industries, the added value of the primary industry was 4.519 billion yuan, up 5.8% year on year; The added value of the secondary industry was 3.135 billion yuan, up 3.5% year on year; The added value of the tertiary industry was 4.493 billion yuan, up 4% year on year. The ratio of three industries is 37.2:25.8:37. The added value of the non-public sector of the economy was 6.142 billion yuan, up 3.3% year on year, accounting for 50.6% of the regional GDP.