[The look he gives Barry is probably best described with "Oh come now" - clearly, he isn't taking that line of questioning very seriously at all, though whether he minds is possibly a different matter.]

It's not so much that we're lost as it is that the entire area is completely unfamiliar; it's obviously no Albion, let's put it that way. The paths are clear enough, however, and it's obviously all been mapped out; it's just a matter of exploration at this point.

[tl;dr - OH GOD WE HAVE NO IDEA WHERE WE ARE]