The Kiwanis Trail is an 8mi rail to trail conversion in Adrian, Michigan that roughly follows the Raisin River.  It is the first component of a much longer proposed regional greenway trail, the River Raisin Greenway, that when complete will extend from 

The Heideschnuckenweg is one of the most scenic paths that leads from just south of Hamburg until Celle. It is 223km long and is split into 13 Stages. This stage is second longest, and is easily reached with public transport at the start and the end. The terrain is largely trail with some road sections.
https://www.heidschnuckenweg.de/etappe/8725/heidschnuckenweg-etappe-1.html
- Submitted by Jon-Paul Hendriksen

The Blue Ridge Horse Trail in the heart of the Missouri Ozarks weaves through the hills and hollows of the Eleven Point Ranger District in the Mark Twain National Forest.  Climbing from low hollow bottoms to rocky ridge tops, the trail meanders through a forest of oak and pine. The Blue Ridge Horse Trail is about 10 miles long. 
https://www.fs.usda.gov/recarea/mtnf/recarea/?recid=21720 

As a traditional FKT route in China, Haba Snow Mountain main peak altitude of 5396 meters, the peak year-round frozen. "Haba" as the Naxi language, meaning gold of the flowers. Haba Snow Mountain and Jade Dragon Snow Mountain in folklore is seen as Dixiong Liang, in addition to Haba Snow Mountain is also seen as the local Tibetan people's sacred mountain. Jinsha River from the middle of two tall, tall and straight flow through the mountains, forming a Tiger Leaping Gorge.

The ascent is about 11km with 2700m elevation gain.

Witfontein Nature Reserve, near George, South Africa