Route: Nashua River Rail Trail (MA, NH)

The Nashua River Rail Trail is a 12.3-mile paved mixed-use rail trail in northern Massachusetts and southern New Hampshire under control of the Massachusetts Department of Conservation and Recreation (DCR). It roughly follows the course of the Nashua River, passing through the towns of Ayer, Groton, Pepperell, and Dunstable, Massachusetts and ends about a mile across the New Hampshire state border in Nashua, New Hampshire. The trail is used by walkers, cyclists, inline skaters, equestrians, and cross-country skiers. 

Parking is available at the Ayer center parking lot, on Groton St, in Ayer. There is also parking at the Nashua end of the trail. The route has gentle inclines but few noticeable gradients.

https://www.mass.gov/locations/nashua-river-rail-trail