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county of southeastern Wales. The present county of Monmouthshire borders England to the east, the River Severn estuary to the south, the county boroughs of Newport, Torfaen, and Blaenau Gwent to the west, and the county of Powys to the north. The heart of the county is the plain of Gwent, in the basin of the River Usk, which adjoins the undulating coastal plain along the Severn estuary. To the east is the deeply incised valley of the River Wye and its flanking hill country. To the north the county includes a section of the mountainous Brecon Beacons National Park. The present county of Monmouthshire lies entirely within the historic county of the same name, which also includes the county boroughs of Newport and Torfaen, most of the county borough of Blaenau Gwent, and part of the county borough of Caerphilly