 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.The citations for the series of sites provide common information.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.