Ancient region on the Adriatic Sea that includes parts of present-day Montenegro, Albania and Croatia (7)

I believe the answer is:

illyria

(Other definitions for illyria that I've seen before include "Classical Albania" , "Country of "Twelfth Night"" , "setting at start of Twelfth Night" , "ancient European state" , "Adriatic coastal area, scene of Twelfth Night" .)

I've seen this clue in The Mirror.

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