Thal'Dranath is an island that was seen in the early alpha builds of World of Warcraft: Legion. This is my vision of what Thal'Dranath would look like had it been kept in the game. Everything is in an unfinished state at the moment, so don't really expect that much.
definitely seems like the ADT was on the edge of a terrain cut from the wow devs, use this ADT as the template ADT. It shouldn't do that.
Edit: ADT error wasnt a good way to put that, so made my wording better.