Cangnan County, subordinate to Wenzhou City of Zhejiang Province, is located in the southernmost coastal area of Zhejiang Province, bordering the East China Sea in the east and southeast, bordering Fuding City of Fujian Province in the southwest, Taishun County in the west, and Pingyang County and Wencheng County in the north. The jurisdiction covers an area of 1079.34 square kilometers, of which the total land area is 1068.71 square kilometers, the island area is 10.63 square kilometers, and the coastline is 206 kilometers long. It has jurisdiction over 16 towns and 2 ethnic townships. County government in Lingxi Town people's Avenue. By the end of 2021, Cangnan County has a registered population of 990,200.

Cangnan city is 81 kilometers away from Wenzhou city, 432 kilometers away from the provincial capital Hangzhou, 104 national highway from north to south through the city. National Highway 104, Yongtai-Wen Expressway, Shenzhou-hai Expressway and Wenfu-Fuzhou Railway pass through, and Xiaguan, Yanting and other ports connect the interior and exterior. 78 provincial Highway, Longjin Avenue, Linglong Avenue, Sea Road and other links. There is Cangnan Station within the territory, the construction area is 27,000 square meters, the station yard scale for 3 sets of 6 lines.

In 2021, Cangnan County achieved a gross regional product of 39.962 billion yuan.