"obscure territory" is a correct and usable phrase in written English.
You can use it to refer to a place or subject that is unknown, unfamiliar, or mysterious. For example: "Exploring this new field of study was like entering an obscure territory."
He pours over data sheets, checking the release dates of the record in obscure territories across the States.
The story of Russia's colonies in Alaska and northern California have been filed away in obscure historical territory for those who come from outside of Russia, but for author, journalist and historian Owen Matthews, it became the core topic of his book Glorious Misadventures.
But the publication last week of a long-awaited US Senate intelligence report has raised fresh questions about what the UK knew about the CIA's torture programme – and in particular the role played by an obscure overseas British territory.
Although the exact limits of his territory are obscure, it evidently stretched south of the Pripet Marshes between the Don and Dniester rivers.
A similar tactic was tried in 2005, when $25 million in North Korean accounts was frozen at Banco Delta Asia, an obscure institution in the Chinese territory of Macao.
A free jazz drummer and long-time Communist party member with a fondness for obscure European surrealists … not exactly Robbie Williams territory.
And it will remain that way to a certain extent — this isn't layman territory and things will remain obscure.
Kaplan may argue that the brightly colored patches of sovereign territory on a two-dimensional map obscure Nature's primordial blueprint, but citizens now have incentives to obscure the lines of their governments with the demarcations of their own communities, imagined and real.
The past territories of cities are often obscure due to lack of spatial representation.
As a result, the past territories of cities often remain obscure due to lack of spatial representation.
