Here is a map with all currently known spawn points of the Edge of Reality portal in Nagrand.
/way 40 47 Tree
/way 43.6 31.4 Mok'gol
/way 57.3 26.7 BMAH
I didn't write down the names of the people who took the screenshots, but feel free to let me know if you want your name added etc. I will also do my best to add names when I find them again. All the ingame pictures are from wowhead.