So is the lake in the middle of the Zelda 1 map Lake Hylia? Also, are the locations in Skyward Sword and Twilight Princess the same locations as their analogues in other Zelda games, just with different names (e.g. Eldin Volcano is Death Mountain, Faron Woods are the Lost Woods, Lanayru Desert is the Gerudo Valley area etc.). I honestly always thought that each game had a forest, desert, and mountain themed area, as well as a lake in order to incorporate the traditional gameplay elements of the series. It seems so obvious now that each game takes place in the same place.
I like that Termina theory by the way.