Mulgore definately. It's just so beautiful, calm and peaceful. It's the nicest zone of them all.
It used to be most of the Eastern Kingdoms, but it's definitely become Uldum. None of the other Cataclysm zones can compare to the fun to be had,
Mulgore is my favourite zone, simple wide open plains but it still made a huge impression on my first time logging in.
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Stranglethorn Vale. Love the trolls and all the old school pvp battles at Nessingwarys camp.
My favorite zone has to be The Storm Peaks. It is first off special to me in that my first ever 80 hit level 80 from finishing the Hodir quest line. I hadn't started playing until Wrath of the Lich King, so this was my first ever character at the level cap and my chance to experience the endgame. (Which I love leveling and all, but the endgame is where everything is at.) The storm peaks is a thoroughly amazing zone filled with lore and overall amazingness. I remember dinging 80 and I thought it was so cool that I could wear the Titansteel destroyer which I had made with blacksmithing prior to hitting 80 (Yes I had 450 mining and blacksmithing prior to level capping, yes I am weird.) It is filled with lore about the Titans which was very interesting to me in that I enjoy real life mythology as well as the lore of Warcraft. Ulduar resides within the Storm Peaks and if you ask anyone who played wrath, Ulduar is the best raid in the Wrath of the Lich King expansion. Considering this was my first time being level capped, it remains to be my favorite raid ever. To see all of the Titans being controlled by Yogg-Saron was quite entertaining to experience. Ulduar reminds me alot of various aspects of Norse mythology (Not just names) and some of Greek mythology based on many of the things that happened.It remains a place I go still today at 85. I still wish to get the Ulduar achievement drakes (Which due to people not listening to instructions I still don't have :/.) I also want to get that dang polar bear which I have done the daily there upwards of 50 times and no bear while I did it once for a friend and they got it on their first bag. Also eventually wish to find the Time-Lost Protodrake (Living this time.) I have had NPC_Scan pick up its corpse 3 times now but yet to find the living thing. All in all the Storm Peaks made a great initial impression on me and continues to amaze me to this day a year later.
My favorite zone would have to be Nagrand. I love the openness and the green plains, the floating bits and the cascading waterfalls. Mind you, the repetitious quests were annoying, but Nagrand was one of my favorite places to run/fly through.
My favorite zone would have to be Mount Hyjal. It's just so pretty!
I can't decide between Nagrand and Shadowmoon Valley.Nagrand has that green and alive thing most of us love and is quite a change from the usual WoW scenery, plus epic questlines and fun PvP zone. Just flying around, looking at the floating waterfalls, trees floating, and the world below you gave me a feeling of calmness and ease that no other zone could ever give me. I remember sitting at that platform near Oshu'gun just looking down, contemplating the view and thinking about nothing or everything sometimes. :PAnd the simbols near the mountain always remind me of the Nazca Lines. Gives you a lot to think about.Then SMV has THE epics quest ever. Unlocking the Ashtongue faction, freeing Teron Gorefiend, fighting the Legion and a long etc. I just love the place. It's full of lore, fun, challenges and of course, Black Temple.It's a very though choice, but I guess if I had to pick it'd be Shadowmoon Valley.
I would have to say Vashj'ir is one my favorite zones post-cataclysm. The underwater leveling and the super fast sea horse made the questing in Vashj'ir one to be remembered. I loved the battle-maiden quest chain and the ending is preety epic imo.
Thunder Bluff, because I was there all day in TBC.
I would have to say Azshara since the shattering. The quests just were a lot of fun and Azuregos is hilarious.
My favorite zone is undoubtedly Un'Goro Crater. Always been a fan of Jurassic Park, and the constant threat of giant ravasaur attack made everything a little more fun. And don't forget Larion and Muigin.
ULDUAR FTW
My favorite zone so far is Mount Hyjal. There are three reasons it is my favorite. First of all it is the latest zone I have lived in. With Cataclysm, the latest zone has been my favorite. My second reason is the content in this zone is varied. It doesn't seem like the same quests over and over. I also like the fact that some of the damage is being rolled back. Maybe, we can win.
Tirisfal Glades - simply for the atmosphere. A good portion of my fondest WoW memories are associated with the zone.
My favourite zone is Azshara because of the mini golf field there ....