The Scale of Godgrave

I was reading chapter 1882 (Entering the hollows) now I realise that hallows will not actually below the rib cage like in the thoracic cavity rather they were inside the bone(damn) so the whole jungle was inside a singular bone. I fail to comprehend the scale of Godgrave every single time.

I was reading chapter 1882 (Entering the hollows) now I realise that hallows will not actually below the rib cage like in the thoracic cavity rather they were inside the bone(damn) so the whole jungle was inside a singular bone. I fail to comprehend the scale of Godgrave every single time.