i think the regions from the console games and pokemon ranger shouldn't be in the official canon, nor the orange islands.
Should Manaphy not be counted in the official canon, either? because that pokemon DEBUTED in Pokemon Ranger (well, it's egg at least), and the only way to officially get it (not counting traveling events) is via a transfer from Pokemon Ranger/Batonnage to Pokemon Diamond and Pearl. Also, if the Orange Islands were shown on the official maps, then it's in the official canon.
And anyways, if you've missed the event in Firered/Leafgreen that allows Ho-Oh and Lugia to be captured, the only way to even GET these 2 pokemon IS through Pokemon Colosseum/XD, plus in Colosseum's case, it is also the only way legit way to get Celebi into the 3rd gen games/1st gen remakes (I consider the traveling store-hosted events like Pokemon Rocks america as an unofficial way to get them.).
Now, the Stadium games, Channel, and the Mystery Dungeon games I can definitely say aren't of the Official canon, whileas Pokemon Snap is debatable.
Anyways, I have a theory as to what the Pokemon World looks like. all of them are of the locations in the games/anime (save for maybe Pokeria City, that one was made up by me.). I'll show you a drawing of what I think it looks like, as soon as I get the Chance.