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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