Just to belabor a point from MW...the second meaning of saddle, geographically speaking, was:

b : a pass in a mountain
range


...and that supports the Alabamian application of gap for saddle

But it doesn't support the photographs I've seen of mountain saddles that showed elevations more like the first part of the definition. See MW part a. in my post above

Good to have a knapsack filled with various applications.