Ok. This is very challenging location for a rift. Atop a mountain. No roads lead up here. Can not get cart up here. Need to climb to get to the rift beam. But can lead a horse up to the rift beam. Lots of tree problem, needs addressed up here.
On this map is best guess the location of it. The white path tracks from that guard tower (if u can find that) to the rift thru the woods.
Hergasterix and I investigated this area, killed local mobs.
Good luck whoever decides to try this rift 🙂
Teeebomb
Some kind soul (Thanks Timegypsie !!) chopped trees to show to path from the Sandstone Cove direction. Once u follow the roads West from Sandstone Cove and up into the woods u'll see them.
This is the path from Sandstone Cove (Thanks Ronal o/):
https://imgur.com/5sOEfln