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 enourmous, 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.

The map of Subrosia is 120 miles by 120 miles. The size of this map is 14,400 square miles. This means that while there is one large village of subrosians, it is definitely possible for there to be other smaller villages scattered around subrosia. Basically its all up to your imagination what you find in both Subrosia and Hyrule, so have fun with it!