Which city does dushan county belong to?

It belongs to Qiannan Buyi and Miao Autonomous Prefecture.

Dushan county, which belongs to Qiannan Buyi and Miao Autonomous Prefecture of Guizhou Province, is located at the southernmost tip of Guizhou Province, bordering Nandan County of Guangxi, and is the only place for Guizhou Province and even the southwest region to enter the estuary of Guangdong and Guangxi. Guangdong and Guangxi in the east, Yunnan and Guizhou in the west, ASEAN in the south and Tianfu in the north. It is known as the "South Gate of Guizhou" and "Southwest Gateway".