:::EDIT:::
I know this is a repost, the area at least. but not the way to get to the area
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If this is a repost sorry, all i could find similar to this is how to get into the incorrect instance of epl, and that one doesnt work anymore.
Found another one today, unfortunately you do need to be a mage, although you can do this with warlock fears/hex/sheep, ect. just a lot harder.
So go to ghostlands, take the rout i describe on this map:
Keep following the coast. you will need to blink through or get sheeped/feared w/e through 3 or 4 invisible walls along the coast.
once you find land it should look like this:
Not really much to do back here, if I find anything else out other than it is an unknown zone i will post it.
:::EDIT:::
keep looking around and you will find a way to almost get into the mountains ( wall jumping almost got me there, ill return later to try it out) but you will also see a white expanse of nothingness.