This large area is essentially completely undeveloped and unpopulated by humans. It served as an experimental ecosystem area where under high oxygen conditions the kaiju could thrive. These experimental animals have established a stable macro-scale ecology. A large organic machine known as the Boustrophedon systematically roams the Vast Deferens, devouring and tilling in its wake.
The Vast Deferens consists of a large swath of desert-like scrubland littered with creosote bushes and sand dunes, but it is punctuated by numerous green oases centered about supply vents which faithfully pump in oxygen, water, and organic molecules which enable the atypical ecosystem to persist.