TransQilian is a ~105km loop course through the Qilian mountain range in Gansu province at ~10,500ft average elevation going as high as 14,600ft. This is an established loop (there is an ultra race on it which was in its 5th edition in 2019).

Kendrick Peak outside Flagstaff, AZ, from the Kendrick Trailhead to the fire tower, via the Kendrick Mountain Trail.  The 7km ascent has a Strava Segment.

A popular trail run near Torreon.  This 4.5km route has a Strava Segment.