50 C.F.R. § 34.4
In order to receive payments under the Act, a county must qualify under the definition in § 34.3(c) of this part and there must be located within the county, areas of land owned in fee title by the United States and administered by the Secretary of the Interior through the Fish and Wildlife Service, including wildlife refuges, waterfowl production areas, wildlife ranges, wildlife management areas, fish hatcheries, research centers or stations, and administrative sites, and these areas must be solely or primarily administered by the Service. In addition to this Act, reserve areas administered solely or primarily by the Service are entitlement lands under section 6(a) of the Act of October 29, 1976 (Pub. L. 94-565, 31 U.S.C. 1601-1607 ), for which regulations are published in title 43, part 1880, Code of Federal Regulations.
50 C.F.R. §34.4