Hill Country

I have wondered why Luke alone among the NT writers uses the phrase “hill county” as a geographic description. Somewhere I noted in my research that this expression described: “The highland area of Judah between the Hill Country of Ephraim and the Negeb, bordered on W. by the Shephelah, on E. by Wilderness of Judah.”

My question is this: Does Luke have any other purpose in mind in using this phrase in Luke 1:39 and 1:65?

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