As a characteristic agricultural product of Fushun County, single-piece black fungus grows in the upper reaches of Dahuofang Reservoir within Fushun County’s ecological agricultural zone. The producing area boasts superior natural conditions, high water quality standards and a forest coverage rate of 68.8%. There are zero industrial pollution enterprises, and no chemical pesticides are applied, making the product superior to black fungus from other regions.

The geographical indication protection scope of "Fushun Single-piece Black Fungus" covers 95 administrative villages across 8 townships in Fushun County. The land suitable for its cultivation spans 1,638 square kilometers, with an annual output of 3,800 tons.