 The ridges of Fort Valley administered by the U.S. Forest Service contain several Special Biological Areas (SBA).These include Mudhole Gap SBA in the northern end of the Little Fort Valley; Peters Mill Run Bog SBA in the upper reaches of the Little Fort Valley area just south of Woodstock Tower; Signal Knob SBA and the Edinburg Gap Shale Barrens SBA, two of the easternmost Appalachian shale barrens ; and Scothorn Gap SBA, a 34 acre forest plan-designated Special Biological Area in the southernmost edge of Masanutten Mountain.Waterfall Mountain Cliffs, in the southern extremity of the Fort Valley's Masanutten Mountain ridgeline just south of Scothorn Gap, has been recommended by Virginia Division of Natural Heritage to be designated as a Special Biological Area as it contains significant amounts of semi-primitive acreage.