Delaware Water Gap National Recreation Area is a 70,000-acre protected landscape in New Jersey and Pennsylvania along a 40-mile stretch of the Delaware River, centered on the narrow water gap where the river cuts between Mount Minsi and Mount Tammany. Long used as a transportation corridor, the valley was first inhabited by the Munsee Lenape and later settled by Dutch and French Huguenots. Today it is a heavily visited destination for river recreation, trails, waterfalls, and historic sites. Its modern form grew from the canceled Tocks Island Dam project, which displaced thousands before opposition, funding problems, and fault-line concerns ended the plan in 1978.