Best zone for level 51 in World of Warcraft?

[Sveiningos]

I'm a level 51 Orc Warlock in World of Warcraft. Where is the best zone for me to lovel up?

[MapleDealer]

Un'goro Crater, Western Plaguelands, Felwood, once your about 54-55 you can hit the Eastern Plaguelands, and Silithus till your 58 where you can then start Outland

[knoxville102]

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[vangel]

At level 51 you should be in the badlands, and into Un'Goro crater. Stay in the crater until level 53, then head to Burning Steppes! As always you should grind as much as you can through each quest, and remember to park yourself inside an inn (preferably in a major city) every time you log off.