Boundary and Zone

Boundary

Boundary noun - A real or imaginary point beyond which a person or thing cannot go.

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Zone and boundary are semantically related. In some cases you can use "Zone" instead a noun "Boundary".

Nearby Word: bound

Zone noun - A broad geographical area.

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Boundary and zone are semantically related. Sometimes you can use "Boundary" instead a noun "Zone".

Nearby Words: zoned, zoning, zonal

safe	safe boundary	safe zone
particular	particular boundary	particular zone
original	original boundary	original zone
real	real boundary	real zone
Other adjectives: major, final.

Some of the more elaborate ranged enemies, for instance, have the boundary between safe zone and kill zone measured in single pixels.

Source: Video Game / Ninja Senki
The invisible boundary for the mission zone closes in towards the target as time runs low, though it does not seem to have any noticeable effects on the mission.

Source: Manga / Gantz
The age of a star can change the conditions of whatever planets orbit it as it grows bigger and hotter as it ages by pushing the habitable zone (an invisible boundary where liquid water can exist) outwards.

Source: Terraform