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Discover Ludwig"the frontiers" is a correct and usable phrase in written English.
It refers to the boundaries or borders that separate two countries or regions. Example sentence: The government is working to strengthen security along the frontiers to prevent illegal immigration.
Dictionary
the frontiers
noun
That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.
Exact(58)
The frontiers are disappearing.
We want to break through the frontiers.
"That's the nature of the frontiers of science".
This is where the frontiers will be drawn now.
There were no wars except at the frontiers".
Sky lobbies mark the frontiers between these uses.
Meanwhile, the frontiers of science continue to expand.
A tour of the frontiers might begin with the East.
A single customs and border-police service staff the frontiers.
The frontiers will shift in the coming months.
But as conditions on the frontiers or the frontiers themselves were changed, the special importance of the old marches diminished.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com