Robert Rives posted the route:

This cross-state trail starts in the northwest corner of RI in the Buck Hill Management Area on the Massachusetts border and travels over a variety of surfaces to the beach east of Quonochontaug. You can find info concerning this trail at the following websites: www.rigreenways.org/paths/nst-data.htm, outdoors.htmlplanet.com/nst/nst_map00.htm

Cannon Cliff is a steep ridge cliff on the east side of Cannon Mountain in New Hampshire. The cliff has several climbs that link up to trails atop and on the sides to make up for several challenges of combining trail running and moderate climbing, taking into account the rules that climbing do not exceed 10%. This is the east coast equivalent to the Flatiron FKTs in Boulder. The routes starts at the climbers kiosk at the Profile Lake parking area. 

http://www.hikenewengland.com/WachusettMA090518.php

There are two main trails that partly overlap in the Middlesex Fells (https://www.mass.gov/locations/middlesex-fells-reservation).

This is the Skyline Trail a 7 mile challenge.

jtumber posted:

I came here to see what the FKT is on my favorite local running route - the Middlesex Fells Skyline Trail! Turns out, there is no thread yet, so I guess I'll make the first post.

Ben Nephew posted the route: