[SPOILER] Just how big is Penumbra

[thetury455]

Warning this thread may contain some spoilers - you've bee warned.
Just how big is the area where Penumbra takes place? when I was playing Penumbra (I noticed this in Black Plague) in one of the areas you can look out a window and see just how huge everything looks. The whole place feels massive... so just how big is Penumbra (the area I mean)?

The size of a house... Dude this question is imposibruu to answer :/