Cissbury Ring is an 84.2-hectare (208-acre) biological Site of Special Scientific Interest north of Worthing in West Sussex. It is owned by the National Trust and is designated a Scheduled monument for its Neolithic flint mine and Iron Age hillfort.

The Worthing Downland Estate, Worthing Downs or Worthing Downland, is an area of land in the South Downs National Park in West Sussex, England, close to the town of Worthing. It was bought by the public, following threats to the beauty spot of Cissbury Ring and the surrounding farmland, which led to a public campaign purchases in the 1930s. It is currently owned and managed, on behalf of the public, by Worthing Borough Council.