My favorite zone is.. hmm, hard decision. I always liked Nagrand due to its beautifullness but in the end I'd say it's Shadowmoon Valley. I love the spooky atmosphere wit all those important quests, where you slay highranked members of something. :D
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My favourite zone has to be the Wowhead Recycle-bin, all the insane things and alike that's going on in there is just plain awesome.
I really loved the Maelstrom... granted it was only visitable twice. The scenery was great, an island sized vortex swallowing the entire ocean, the sounds of roaring waters, and three really powerful dudes keeping it all together. At the end of it all I have to keep asking myself where did all that water relocate to since it obviously did not flood into deepholm. The reason I enjoyed this place is simple, it keeps me guessing :)
Un'goro Crater i one of my favourite zones. Blizzard's attempts to immerse you into a lost prehistoric world work incredibly well and the whole atmosphere feels humid and realistic (especially with the giant Devilsaur stomping around after you).
My favorite quest zone was Westfall it seemed so interesting because of some of the lore i found out! Go Explorer's League!
Ungoro Crater, extremely unique "faun and flore" with a really nice background music, and of course, it's the laboratory of the titans ;)
My vote goes to Grizzly Hills. Such a relaxed and nice zone on your way to 80, with lovely music. I make sure to do that zone on every toon I level, and there isn't a single other zone I don't skip at times.
Nagrand is my favourite. The whole zone is just so beautiful to me. I'd make my home there (or in neighbouring Shattrath) if I could.
My favorite zone would have to be Vashj'ir for the environment and the scenery that BLizz put into that zone. There are parts that are just vibrant with colors and are just beautiful
My favorite zone is Isle of Quel'danas , the music there is a tier above all other zones sounds , and i just like the Sunwell story :P
StrangleThorn Vale, hands down,has been and always will be my favorite zone. From it's vast environment to it's eccentric quest hub,STV offers hours upon hours of enjoyable gameplay. It will always have a spot in my heart. The scenery found within StragleThorn is breathtaking, and I've always enjoyed the "JungiliY" zones.
My Favorite zone would have to be Winterspring. when i first began playing wow back in vanilla i had always wished to get to this zone, when i finally did i lived it the quests here were awesome and they love me in that tunnel on all my main toons =]