Sydenham Hill (as well as Upper Sydenham) is on the large Norwood Ridge formed of London Claygate beds deposits. As a result, Sydenham Hill is one of the highest points in London at 367 feet (112 m). Sydenham Hill Wood is a nine-hectare nature reserve west of Sydenham Hill Road, along with Dulwich and Sydenham Hill Golf course. The hill was once covered by the Great North Wood which covered all of Sydenham, Norwood, Woodside, Gipsy Hill etc.