The Mammoth Cave National Park Boundary Adjustment Act of 2025 proposes to expand the boundaries of Mammoth Cave National Park in Kentucky. This legislation specifically authorizes the Secretary of the Interior to acquire approximately 551.14 acres of land , which are generally depicted as a "Proposed Addition" on an official map. The acquired land, located in Edmonson and Barren Counties, would be incorporated into the national park. Additionally, the bill amends existing law by inserting a provision to adjust a specified $350,000 land acquisition limit for inflation , ensuring future land purchases reflect current economic values.