25 USC 459a - Designation of tribes

(a) Description of lands 
The lands, declared by section 459 (a) of this title to be held in trust by the United States for the benefit of the Indian tribes named in this section, are generally described as follows:
(b) Publication in Federal Register of boundaries, etc.; estimation of acreages 
The Secretary of the Interior shall cause to be published in the Federal Register the boundaries and descriptions of the lands conveyed by this subchapter. The acreages set out in the preceding subsection are estimates and shall not be construed as expanding or limiting the grant of the United States as defined in section 459 of this title.