I believe it regarding size.
AgtJake who's a big souls lore youtuber and has over 1000 hours in Elden Ring said that even though the map is size wise "only" as big as Limgrave,it is so dense and so insane in the amount of verticality,dungeons and intricate areas you explore that if you take it and lay it down just horizontally as a whole it's about as big as Limgrave,Liurnia,Caelid,Altus Plateau,Leyndell and Nokron put together.
That is just ridiculous.Its basically Elden Ring 2 at this point.
He also said each dungeon is extremely varied this time around and each of them are unique.