According to AllTrails.com, the longest walking trail in Columbus is Alum Creek Trail: Wolfe Park to Big Walnut Creek. This trail is estimated to be 17.2 mi long.
Columbus: With an ascent of 311 ft, Alum Creek Trail: Wolfe Park to Big Walnut Creek has the most elevation gain of all of the walking trails in the area. The next highest ascent for walking trails is Scioto Trail Loop with 229 ft of elevation gain.