You will find no article before vast territory, bear territory etc. when the territory is used to mean 'country'. In your example the word territory can't be replaced with country but it represents a money concept rather than a physical area with its borders in which case it would have an article.
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Musicgold I don’t understand why there is no ‘the’ before ‘sell territory’.Abstract nouns do not take an article, and sell territory is an abstract (compound) noun. The reference is not to any physi
Yesterday, two of our most important indicators moved into sell territory.