40-Acre Rock features some of the largest and best developed granite flatrocks in the Piedmont Area of the eastern United States. Located in Lancaster County, South Carolina, this 1,569-acre preserve is one of the most diverse protected natural areas in the state. Over a dozen rare, threatened or endangered animal and plant species make their home among its many contrasting landscapes featuring a diabase dike, waterfall, waterslide, cave, extensive beaver dam system, Piedmont cove forest and Piedmont flood plain. In 1999, The Nature Conservancy, South Carolina Chapter, purchased from the Hancock Timber Resource Group a 142-acre site contiguous to 40-Acre Rock Heritage Preserve.