Adlatum is not an official continent. It is fan-made. However it has been noted in a couple of the Ansalon maps released in the map pouches, so it exists officially.
Of course we could discover officially that Adlatum is actually just a single five square foot island with a palm tree and two coconuts (see below).
It's occurred to me that putting up links or Adlatum info here would be rather redundant right now since the DL Nexus is sporting everything. However the one thing the Nexus can't post is FanFiction, and since any stories taking place in Adlatum right now would be considered such, this means the Nexus can't host them.
If you go to the 'Fiction' section, I do have a very small amount of Adlatum fiction available.
