Where open to public access, the remaining of trail follows an elevated plateau of 400 million year old metamorphic rock punctuated by occasional monadnocks. The terrain is a rural and largely wooded, post-glacial landscape with sparse viewpoints, deep ravines, and a few bare mountain summits. The trail follows the western edge of this plateau in a northerly direction, then jogs east along the Massachusetts/New Hampshire border before turning north again to reach Mount Monadnock. Prominent features on or easily accessible from this part of the M&M Trail include, from south to north, Rattlesnake Gutter (a boulder-filled chasm), Ruggles Pond in Wendell State Forest, the Millers River, Farley Ledges, Briggs Brook Falls, Northfield Mountain and reservoir (a hydroelectric reservoir carved out of a mountain top), the historic Hermit Cave, Crag Mountain, Mount Grace, Highland Falls, and Royalston Falls. In New Hampshire, the trail crosses the summits of Little Monadnock Mountain (in Rhododendron State Park), Gap Mountain, and Mount Monadnock. All three of these peaks have exposed summit ledges. Mount Monadnock is the most prominent peak of southeast New England. At high, it is higher than any mountain peak within and rises above the surrounding landscape. Its bare, rocky summit provides expansive views.