Look at the whole map

[lemekim]

Does this have GM Island on it?

-Bolty
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There is an island waaaay out of reach (about distance of 2-3 zones from shore) on Kalimdor map, but it only has a single house on it (about the size of an Inn) and is somewhat small. It may or may not be it - but small as it is, it would fit the description of "not reachable by normal means". It has also a little dock, so <rampant speculation>
there might be an NPC that teleports GM's to it, but is only accessible/visible based on some reputation status or something similar to Caer Darrow invisible NPCs. Through digging in MPQs one might find some info about this and find a way to get to the island.
</rampant speculation>

Also, Outland is "possibly" reachable even now. Physically it's located somewhat south-west of Azeroth main continent, and is "only" about a zone distance away. Quite a spectacular landscape. Once I get home, I'll take screenshots of the two continent maps to give you a better idea.

A strange thing that I noticed was that I could not find Emerald Dream. Although I have not looked below Ashenvale as opposed to some unreachable land.