On road between Dun Akafell and Akamora, the road running west to east over the hill seems to have a cliff intersect it in such a way that it's invisible to the player until they collide with it's edge. Doesn't marry up quite with the road.
 

My coords -->

> player->getpos x
235182.187500
> player->getpos y
-95119.351562
> player->getpos z
3860.780273