This is my first post here(I made an account a year ago and forgot), and I couldn't find a topic about this, so I decided to go ahead and share what I found in case it was new.
If you swim out into the ocean From Dustwallow marsh (Theramore is a good place to start) And swim east, you eventually get to fatigue water, but at the time I was Restoration druid, so Lifebloom was enough to keep me alive, other classes might be able to get out there if they can heal through Fatigue. After a long time i the fatigued water, I got to the edge of the server but unlike the edge of most zones, there was a strip of land before the server ended, and I didn't take fatigue on it.
Nothing special from what I could tell, just a cool thing to see if you've never been there.