Long, long ago, in what surely feels like another galaxy, there were a number of competing setting proposals for L4W. Exactly how many there were, or whether they were distinct or evolutions of each other, is... subject to interpretation, if not outright lost in the mists of time. (In other words, what follows is from my far-from-perfect memory; many grains of salt should be taken with it.)
I think the first proposal was the Imperium, from Graf. It was a many-world-spanning empire of eladrin, corrupt and full of intrigue and whatnot. Think of a combination of Sigil and ancient Rome. I think the idea was that most adventures would take place out in the hinterlands, kind of Farscape style. It was an absolutely wonderful setting, and I would have loved to play a campaign in it, but the consensus at the time was that it was a bit overdeveloped for a living world. We wanted something a bit less established, more points-of-light, more of a blank canvas for DMs to develop organically over time.
Graf went back to the drawing board and came up with the Transitive Isles, with the explicit goal of making something modular and blank-canvas-like. We all liked the Imperium too much to abandon it completely, so a minor outpost of it became one of the near islands. Everybody liked it, but we didn't want to close off discussion to new proposals, so we kept tweaking it and whatnot while waiting for other proposals.
Allaria was one of those other proposals. I can't remember who came up with it (Halford, maybe?), but the idea was to have a proposal that was mostly land-based, instead of the islands-in-a-big-sea of the Transitive Isles, since one of the few concerns about TI was that there might not be enough land mass and that things would get too scrunched together. Someone -- again, I've forgotten who -- put together some suggested maps for Allaria, which I think is what you linked to. They were never "official" in even the limited way that the Near Isles map is "official", but they're still out there.
Enthusiasm for Allaria was slight, but not nonexistant, and eventually someone suggested as a compromise that we merge the proposals by making Allaria one of the Far Lands; that if DMs found the Near Isles too cramped, they could pop through a portal and adventure there. Nobody had any serious objections to that, and it seemed to satisfy those who liked Allaria, so that happened.
The Wild Lands of Zheen was yet another separate proposal for L4W. It never really got off the ground, as you can see from its wiki entry.
None of these are related at all to the setting in LEW, which is entirely different. See here:
LEW
