This route (SOBO) starts in the middle of the Mahoosuc range on the NH/Maine border and travels the AT 17mi to Rattle River trailhead which is the start to the rugged White mountain 100.

After traversing 5 gnarly mountain ranges in the Whites you take off from Glencliff Route 25 Wachipauka Pond TH, it carries on for the Dartmouth 50 on somewhat more forgiving terrain to Hanover and finishes on the bridge NH/VT border.