Great American Rail-Trail

Being able to ride, run, or walk for over 3,700 continuous miles, from Washington D.C. to Washington State, is the vision of the Rails-to-Trails Conservancy.  You can see the envisioned path at the link below and for Ohioans most of that path is already in place.  Locally, the route between Columbus, Ohio to the western edge of Montgomery County includes sections of Ohio to Erie Trail, Creekside Trail, Mad River Trail, Great Miami River Trail, and Wolf Creek Trail, with the only gap being five miles between west Dayton and Trotwood.

https://www.railstotrails.org/greatamericanrailtrail/route