Lauren,
the Maryland challenge is to do all the AT in Maryland in one day, from the Potomac River Bridge to the Mason Dixon line just past Pen Mar.
The 4 state challenge is to start in Virginia, and finish in Pennsylvania. Obviously, the Mason Dixon line is still the end point, but I’m not certain about the start point. See my prior post. Is the challenge to do all of West Virginia, or just touch the state? If that’s all there is, then you potentially could still start in Harper’s Ferry, and blue blaze across the Sandy Hook Bridge (old AT) into Virginia and back again.
Never heard about a Virginia Challenge.
Then again, there is the Tennessee Challenge, another obscure one. Do from Vandeventer Shelter to Damascus in one day.
Or, the Presidential Traverse, Crawford Notch to Pinkham Notch in one day.
Myself, think I’ll at least sniff the roses.
Peaks