In general the region includes three parallel chains, the Cumberlands, Alleghenies, and Blue Ridge. Like a giant backbone the Blue Ridge, beginning in the southwest portion of Old Virginia, continues northeasterly, holding together along its mountainous vertebrae some eight southern states; northeastern Kentucky, all of West Virginia, the eastern part of Tennessee, western North Carolina, the four northwestern counties of South Carolina, and straggling foothills in northern Georgia and northeastern Alabama. The broad valley of the Tennessee River separates the mountain system on the west from the Cumberland Plateau which is an extension of the West Virginia and Kentucky roughs. Throughout its vast course the Blue Ridge is not cut by a single river. A narrow rampart, it rises abruptly on its eastern side south of the Potomac to a height of some two thousand feet, cutting Virginia into eastern and western, and descends as abruptly on the west to the Shenandoah Valley. Similar in topography in its rough, broken steepness to the Alleghenies across the valley, it consists of a multitude of saddles or dividing ridges many of which attain an elevation of six thousand feet. As it extends south, rising from the Piedmont Plateau, it grows higher. In North Carolina alone there are twenty-one peaks that exceed Mt. Washington's six thousand feet in New Hampshire. Contiguous to the Blue Ridge there is another chain between the states of North Carolina and Tennessee, which to Carolina mountaineers is still the Alleghenies. However, the United States Geological Survey has another name for it--the Unakas. It is higher as a whole than the Blue Ridge to which it is joined by transverse ranges with such names as Beech and Balsam and a sprinkling of Indian names--Cowee, Nantahala, Tusquitee. It differs, too, in physical aspect. Instead of being in orderly parallel tiers the entire system, unlike the Blue Ridge, is cut by many rivers: the Nolichucky, French Broad, Pigeon, Little Tennessee, Hiawassee. The parts so formed by the dividing rivers are also named: Iron, Northern Unaka, Bald, Great Smoky, Southern Unaka or Unicoi. Though many of its summits exceed six thousand feet, the chain itself dwindles to foothills by the time it reaches Georgia and crosses into Alabama. If you flew high over the vast domain of the Blue Ridge, you would view a country of contrasting physical features: river and cascade, rapids and waterfall, peak and plateau, valley and ridge. Its surface is rougher, its trails steeper, the descents deeper, and there are more of them to the mile than anywhere else in the United States. The southern mountaineer has to travel many steep, rocky roads to get to any level land, so closely are the mountains of Appalachia crowded together. It is the geography of their country that has helped to keep our highlanders so isolated all these years.