valley of Virginia, is the elevated plateau-like country lying between the western base of the Blue ridge and the eastern one of the North mountains—Kittatinny as a whole—of the Appalachian system.
Its length is over 300 miles and its average breadth about 20 miles, giving it an area of about 7,600 square miles of the most fertile and productive portion of Virginia.
It is her part of the great limestone valley that extends, for 1,500 miles, from near the mouth of the St. Lawrence far into Alabama.
It is composed of a series of river basins, those of the Shenandoah and parts of those of the James, the Roanoke, the New river and the headwaters of the Tennessee.
Its altitude varies from 500 to 2,600 feet. Its surface is diversified by hills and detached mountain chains and ranges that render it one of the most remarkable fields for military operations in all the country, as is attested by the numerous battles that took place within it in Virginia and its extensions into Maryland and