View over London from One Tree Hill. It is a defining feature of Honor Oak, mostly in London Borough of Southwark but parts also in the London Borough of Lewisham. It includes a 7 hectare public park, local nature reserve and Site of Borough Importance for Nature Conservation, Grade 1,  which is owned and managed by Southwark Council. Its name, and that of the Honor Oak area, derive from the Oak of Honor, a tree on the hill which marked the southern boundary of the Norman Honour of Gloucester. One Tree Hill was once a part of a much larger landscape called The Great North Wood. The London Wildlife Trust is currently working with Southwark Council and the Friends of One Tree Hill to improve the site for wildlife, as a part of its Great North Wood Project.