Historical region, southeastern Wales.
Its heart is the plain of Gwent, and it includes a coastal plain along the River Severn estuary. Gwent was and still is the gateway between England and southern Wales. The Romans built a military headquarters and major fortress in Gwent, and the Normans erected castles. Formerly a Welsh county (1974–96), it has since been divided into several unitary authorities. The economy of the region relies on both agriculture and industry.