Administrative (pop., 2001: 564,559), geographic, and historic county, southwestern England.
It is located at the head of the River Gloucester is the county seat. The Severn bisects the county from north to south. Prehistoric peoples were active in the area, as the numerous burial mounds indicate; later, the Romans had military camps within the county, and Gloucester was a Roman town of note. After the departure of the Romans, the Saxons occupied the area. Throughout the Middle Ages Gloucestershire was a battlefield, reflected in the imposing Norman defensive castles built on the Welsh frontier. The county's Cotswold area is important economically. Most of its eastern half is scenic, and a large area is set aside as the Dean National Forest Park.