This is a block of undeveloped land.
open up undeveloped land, new territory, etc
Indeed, cotton still grows on undeveloped land across from Hudson Alpha.
A corridor of undeveloped land, as along a river or between urban centers, that is reserved for recreational use or environmental preservation.
Although the notion of "foliage trains" has been around since tourist railroads replaced working ones, these trains keep their popularity because most roll through undeveloped land.