Which if you've played Assassin's Creed Odyssey is a statement not to be taken lightly. In an interview with developer Julien Laferrière (translated via Reddit), he notes that although the exact sizes haven't been compared the fact that Assassin's Creed Valhalla features the entirety of England, a large portion of Norway, and other "secret worlds", means it will be a truly massive game. And an ambitious one to boot.

Here's the translation after Julien was asked about the size of the world.

I would actually say in terms of range it is probably a bit larger than Assassins Creed Odyssey. I do not have the exact figures at this stage, but we have not only created the whole country, which is in this case England, but also a good part of Norway too. There are other secret worlds, which I can not speak about today, which contributed to the size of the game. It's not a small game, it is a game which is clearly ambitious, which will offer many many hours of gameplay for the players.

Now, this is somewhat of a controversial response in that there's a sizable portion of the Assassin's Creed community that feels that Odyssey's size and the sheer scope of its world was a detriment to the story. In my own playthrough, after spending well over 100 hours as Kassandra, I feel that Odyssey is one of the best games on the current generation of hardware. An epic with several memorable awe inspiring moments. That said it's still a game recommendation that I make that includes a "but..." - amazing yes, but you'll need a lot of time to see it all. With some regions feeling more like filler.

That opinion of it being the best Assassin's Creed to date comes from playing the exceptional expansions which feature smaller and more focused adventures into the Ancient Greek after life and Atlantis. So yeah, Valhalla featuring the entirety of England to explore sounds great - here's hoping that there's less filler than Odyssey.