Check out the picture above that shows a geological feature in the Blue Ridge Mountains. From this spot you can look down and to the southeast and see Balcony Falls on the James River:
The point from which the picture was taken is shown on the aerial photo below by the camera symbol. Upstream, around Glasgow, the James turns east and has cut a gorge through the spine of the Blue Ridge Mountains that's about 9 miles long and nearly 2,300 feet deep at its deepest point. In this segment of the River, the gradient of the stream (the change in elevation per length of travel) steepens to about 11 feet per mile, as opposed to the average slope from the James' beginning at Iron Gate to Richmond of about 4.3 feet.
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