Mammoth Cave National Park Boundary Adjustment Act of 2025

This bill changes the official boundary of Mammoth Cave National Park in Kentucky. It lets the Department of the Interior add about 551.14 acres to the park, as shown on a specific map for a proposed southern boundary expansion in Edmonson and Barren Counties. The Secretary of the Interior is allowed to acquire this land or interests in it so it becomes part of the park.

Key points:

• What changes: The park boundary is updated to include roughly 551.14 new acres, per map no. 135/177,967 (dated May 2025) for a proposed southern expansion.
• Who is affected: The national park, nearby communities in Edmonson and Barren Counties, and any landowners within the mapped addition area.
• How it works: The Interior Department may acquire the land or interests in the land for inclusion in the park.