[8][9] The sweet chestnuts (Castanea sativa) which line the driveway are at least 500 years old and the remains of a Roman road have been found underneath the drive itself.

[12] Dean Hall Coach House & Cellar (grid reference SO672130) is a 0.02-hectare (0.049-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1988.

[14] The hall (coach house and cellar)[15] is currently home to Greater horseshoe bats which makes it a Site of Special Scientific Interest which is closely monitored by Natural England.

A ring of iron-ore bearing Carboniferous Limestone in the Forest of Dean has created a series of ancient and more recent mines which provide hibernation sites.

Wye Valley and Forest of Dean Bat Sites/ Safleoedd Ystlumod Dyffryn Gwy a Fforest y Ddena are recognised as a Special Area of Conservation (SAC) under the EU Habitats Directive.