Johnson Run Natural Area
Johnson Run Natural Area is a  nature preserve located in Cameron County, Pennsylvania. The topography consists of a rugged, bouldered plateau dissected by steep-sided streams and covered with somewhere from  to  of old-growth forest containing Eastern Hemlock and Eastern White Pine. Some of the white pines are nearly  in diameter at breast height. See also
List of old growth forests

References

Old-growth forests
Protected areas of Cameron County, Pennsylvania