It was one of those tidbits we all kind of seized on in the lead up to Shadow of the Erdtree's release: in response to a question about The Realm of Shadow's size in a February IGN interview, FromSoftware president and Souls series mastermind Hidetaka Miyazaki said "it's probably comparable, if not larger than the area of Limgrave from the base game."
That set the Souls series sicko community speculating: did he mean just Limgrave, or also including its little brother, The Weeping Peninsula, which is actually an island?