Which Zone is Skettis in?Follow

Skettis is in Terokkar forest in the Skethyl mountains. Just fly south from the airbase where you do the daily egg bomb runs and there is a fair amount of adamantite there. Because its a daily quest site its hard to find a time when its not heavily occupied and thus mined out. FYI it requires a flying mount (or flying form) to get there so if you don't have one you can't get there.

I think try Nagrand or Netherstorm is the best spots for adamanite