Stealth in WoW is quite different to Invisibility in other games such as EQ, in that it's not 'Stealth up and nothing will see you', but an agro-range reducer. Get close enough to something and it WILL see you and attack. There are also mobs with Detect Stealth, who see you at an even wider radius.
How close you can get to a mob without being seen is determined by how much higher or lower level than you the mob is. For mobs lower than you your agro radius is very small, about the same size you are in fact, so unless you walk right into the mob you're usually ok. However, the higher above you the mob is, the further away it'll spot you from.
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