Burnham Beeches is one of the best examples of ancient woodland in UK, being located in the area of Buckinghamshire, England. The reserve is also a Site of Special Scientific Interest and a Special Area of Conservation. The extended beech woodland has been often pollarded, with many trees now a couple of hundred years old. It is home to a vast variety of fungi, plants and animals. More than sixty of the species of plants and animals are either rare or under threat nationally. In the south west side of the reserve is situated Seven Ways Plain hill fort, which contains a series of earthworks that have been dated to la Late Bronze Age and Early Iron Age.