| Site of Special Scientific Interest | |
|   | |
| Location | East Sussex | 
|---|---|
| Grid reference | TQ 437 099 [1] | 
| Interest | Biological | 
| Area | 165.0 hectares (408 acres) [1] | 
| Notification | 1986 [1] | 
| Location map | Magic Map | 
Lewes Downs is a 165-hectare (410-acre) biological Site of Special Scientific Interest east of Lewes in East Sussex. [1] [2] It is a Nature Conservation Review site, Grade I [3] and a Special Area of Conservation. [4] Part of it is a national nature reserve, [5] part is Malling Down nature reserve, which is managed by the Sussex Wildlife Trust, [6] and part is Mount Caburn, an Iron Age hill fort which is a Scheduled Monument. [7]
This south-facing slope on the South Downs is ecologically rich chalk grassland and scrub. Flora include the nationally rare early-spider orchid and it also has a diverse invertebrate fauna and an important breeding community of downland birds. [8]