where is shattered halls entrance
Steamvault is one of the instances located under that large lake in Zangarmarsh. Shattered Halls is in the Citadel in Hellfire Peninsula. The entrance to The Shattered Halls is on the second level, above the entrance to The Hellfire Ramparts. Coming from Thrallmar, instead of going down the ramp go straight. As for Steamvaults, the entrance is to the left of the waterfall, you have to walk down a short hall and turn left before you see the portal.