I'm sure you all know how to read a topographic map. But for those who never had a reason to, let me briefly explain.
See the dark lines marked 800 & 900? Those are elevation contour lines. The lighter lines in between represent 20' of elevation each. (rise)
The distance between any of those lines represents horizontal. (run)
Just like a set of stairs. The closer the two are together, the steeper the incline. The further they are apart, the more gentle the slope.
The hollow between B.O.T. & Carbondale, roughly represents a height of 100+or- feet with an incline of 50+or- degrees.
A friend of mine once told me the difference between a Ravine & a Haller.
Ravine- Two people can stand on opposite sides and can talk to each other in
a normal tone of voice.
Haller- Two people standing on opposite sides need to haller at each other
to be heard.
So by "Appalachian standards" that hollow, is a Haller.
Questions or comments? Please email me at firstname.lastname@example.org