This legislation, known as the Mammoth Cave National Park Boundary Adjustment Act of 2025, aims to modify the existing boundary of the Mammoth Cave National Park in Kentucky. It specifically authorizes the Secretary of the Interior to acquire approximately 551.14 acres of land , identified as a "Proposed Addition" on a specific map, for inclusion within the park. This proposed expansion targets land in Edmonson and Barren Counties, enhancing the park's southern boundary. Furthermore, the bill amends a section of the Act of June 5, 1942, to incorporate an inflation adjustment to a previously established financial amount, ensuring its current value is maintained.