The Forest of Dean is a geographical, historical and cultural region in the western part of the county of Gloucestershire, England. It forms a roughly triangular plateau bounded by the River Wye to the west and northwest, Herefordshire to the north, the River Severn to the south, and the City of Gloucester to the east.

The area is characterised by more than 110 square kilometres (42 sq mi) of mixed woodland, one of the surviving ancient woodlands in England. A large area was reserved for royal hunting before 1066, and remained as the second largest crown forest in England, after the New Forest.

The forest is composed of deciduous and evergreen trees. Predominant is oak, beech is common and sweet chestnut has grown here for many centuries. The forest is home to foxgloves and other wild flowers. Conifers include some Weymouth pine from 1781, Norway spruce, Douglas fir and larch. The deer are predominantly fallow deer and have been present since the second world war and number around 300 (there were no deer from about 1855 when they were removed in accordance with an Act of Parliament).

The forest is home to wild boar; the exact number is unknown but exceeds a hundred. They were illegally re-introduced to the forest in 2006. A population in the Ross-on-Wye area on the northern edge of the forest escaped from a wild boar farm around 1999 and are believed to be of pure Eastern European origin.

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