FWIW, PDF o review map of the WMNF here:
https://www.fs.usda.gov/Internet/FSE...prd3802938.pdf
FWIW, PDF o review map of the WMNF here:
https://www.fs.usda.gov/Internet/FSE...prd3802938.pdf
FYI, that map shows current federal ownership in NH not just WMNF but does not show the wildlife refuge lands which butt up against the WMNF boundary in the Cherry Mountain area(which is pretty typical). It also shows National Park Service land in the Mahoosucs which is not WMNF.
The Whites and the HMW both start at the end of the approach trail, of course. Count the steps, touch every white blaze from Springer to Big K, and by then you won't care a whit about anything "official." Or maybe you will.
Ain't nothing 'official' or well defined about the Whites, but I'm thinking geologically, and I'd say that they start with the uplift belt where the trail turns back from east to north and starts climbing past the Dartmouth Skiway. Smarts and Cube are definitely among them at least as foothills. They peter out somewhere around Rangeley.
Where does it start feeling like the Whites when you're hiking? Probably where it starts going above the tree line, which would be Moosilauke.
I always know where I am. I'm right here.
So, after some thread drift into geology, I think most thru-hikers would consider the Whites as Glencliff to Gorham and consider the Mahoosucs as a separate area. The 100 mile (99.4 or so?) wilderness is pretty easy. Monson to Abol Bridge - and there are actually "caution" signs at both ends of it warning of the remoteness and to carry 10 days of food (which few do anymore). That's as official as it gets.