This bill authorizes the Secretary of the Interior to acquire approximately 6,100 acres of land to adjust and expand the boundary of Big Bend National Park in Texas. These specific land parcels are generally depicted on a map titled "Big Bend National Park, Proposed Boundary Adjustment," which will be available for public inspection. A key provision mandates that the acquisition of these lands can only occur through donation or exchange , explicitly prohibiting the use of eminent domain or condemnation. Once acquired, the Secretary is required to revise the park's boundary to include the new acreage. The newly incorporated lands will then be administered as part of Big Bend National Park, subject to all applicable laws and regulations.