Just west on a small island fairly close to the North Landing location on Solstheim there exist a Stone of Stopping, similar to the vanilla stones found across Skyrim.
The player can see the Horkers on the small island from the North Landing, so go there and turn left around the small island which is the opposite to the Stalhrim deposits found on the small island.
This is the first time I discover that and I dunno if the Stone of Stopping also exist in SLE or not, because there is nothing to be found on UESP. What is that and what does it do?