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My Favorite zone is Nagrand. It is by far on off the most peaceful zones to look at in the game. I never get tired of looking at it, and after a grinding stint in Hellfire and Zangramarsh it gives me that little boost I need, letting me know I'm almost set to head to northrend. On top of that you have awesome floating islands for Alone time, plenty of good hunting courtesy of Hemit Nessingwary, a (less than) friendly tourists center in Halaa, and for those with more exciting sport in mind, the Ring of Blood is waiting for you. Sure some of the locals might be less than friendly, what with war going on, but at least you can do it in the Scenic plains of Nagrand!
Deepholm.It's the only zone in my sightFlying circles from dusk to dawnCrying myself to sleep each nightWaiting for Aeonaxx to spawn.8(
Grizzly Hills for me. It contrasts with the idea of Northrend being the Scourge's land, what with a gentle forest and serene music.
I loved the old barrens, because of the forever lost barrens chat. R.I.P.
My favorite zone is Uldum. Flying around on my druid mining for hours in uldum just never gets old.
There are so many beautiful zones it's hard to choose from! But I have to say my new favorite zone is Uldum. I love the whole Sahara desert feel to it with the beautiful oases scattered around. I've always been a big fan of camels, Egyptian tombs, and mummies so I found it really fun to quest in. Not to mention it was nice running into Harrison Jones again. Oh and the ooga booga guys are my absolute favorite. :)
My favorite zone is Tanaris for sure. When I was leveling there pre-BC, it was pretty fun to pretend that I was a old-fashion lone-wolf type gunner! :]
Mt Hyjal most definitely! The quest line was amazing and talk about nostalgia when I saw Ragnaros again! You guys really out did yourselves on Hyjal, both looks and lore!
My favourite zone to visit and lorewise is Eversong Woods. You ca find out about all the history of the Blood Elves right there, just looking around. When Cataclysm dropped, I couldn't help but be impressed by the beauty of Vashj'ir. Huge underwater zone? Yes, loved it! Just too beautiful.