Yanshan County, subordinate to Shangrao City of Jiangxi Province, is located at the north foot of Wuyi Mountains, east to Guangxin District, west to Yiyang County, Guixi City, north to Hengfeng County, south to Wuyishan City, Guangze County of Fujian Province. The county covers an area of 2178 square kilometers, with jurisdiction over 8 towns, 9 townships and 178 administrative villages (communities). County people's government in Hekou Town. At the end of 2021, the total registered population of Qianshan County is 480,700.

Southern Tang Baoda eleven years (953) county, because of Yongping town west four miles lead mountain, mountain county, scribe Xinzhou; After the liberation of Leadshan in May 1949, it was subordinate to Shangrao District, Shangrao Special Zone and Shangrao City. The total area of the county is 2178 square kilometers, and the basic geomorphic features are high in the south and low in the north.
In 2021, the GDP of Yanshan County reached 18.264 billion yuan, an increase of 8.6% over 2020.