The Forest of Dean is a geographical, historical and cultural region in the western part of the county of Gloucestershire, England. The forest is a roughly triangular plateau bounded by the River Wye to the west and north, the River Severn to the south, and the City of Gloucester to the east. The area is characterised by over 110 square kilometres (42.5 sq mi) of mixed woodland, one of the surviving ancient woodlands in England.