Monmouthshire, county, 328 sq mi (851 sq km), SE Wales. In 1974 most of the old county of Monmouthshire was reorganized as the nonmetropolitan county of Gwent; small areas in W Monmouthshire became part of the nonmetropolitan counties of Mid Glamorgan and South Glamorgan. In 1996, when Wales was again reorganized on the local level, the county of Monmouthshire was reestablished from E Gwent.
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