Below are the maps of Hyrule and Subrosia as they are today. The map of hyrule is 320 miles by 320 miles. What this means, is the entire map is 102,400 square miles. This is enormous and as such it is completely possible for there to exist outposts, dungeons, or other such small things without them effecting the overall story and history of Hyrule.
Subrosia, however, is more mysterious. It isn't exactly known what Subrosia looks like, because so few have been there. Basically its all up to your imagination what you find in both Subrosia and Hyrule, so have fun with it!
