Gloucester is a cathedral city and the county town of Gloucestershire in the South West of England. Gloucester lies on the River Severn, bet…Gloucester is a cathedral city and the county town of Gloucestershire in the South West of England. Gloucester lies on the River Severn, between the Cotswolds to the east and the Forest of Dean to the west; it is sited 19 miles from Monmouth, 33 miles from Bristol, and 17 miles east of the border with Wales. Gloucester has a population of around 132,000, including suburban areas. It is a port, linked via the Gloucester and Sharpness Canal to the Severn Estuary.