The article you keep linking disagrees.
Although having given its name to the word henge, Stonehenge is atypical in that the ditch is outside the main earthwork bank.
An atypical example of something is still a “true” example of the thing, especially given that the very term derives its origin from Stonehenge itself.
Edit: Oops, mistook 2 basic pedants regurgitating trivia as the same person.







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