The item Crystalline Eye of Undravius Crystalline Eye of Undravius - Item - World of Warcraft can be used to get rid of the out of bounds fog. I've only tested this in Emerald Nightmare OOB, but my guess is that it works in other places aswell. Just a shame that the CD is so long, but it helped me nail some tricky jumps atleast.
Before: WoWScrnShot_092316_230611 — Postimage.org
After: WoWScrnShot_092316_230603 — Postimage.org
Happy exploring!