ECN site code: T10
ECN monitoring by: Defence Science and Technology Laboratory
COSMOS UK COSMOS-UK soil moisture monitoring
Min. altitude: 100 m

Max. altitude: 172 m
Area of site: 1127 ha

As well as being a Site of Special Scientific Interest (SSSI), Porton Down is also a Special Area of Conservation (SAC) and a Special Protection Area (SPA) covering over 1500 hectares. It constitutes the largest uninterrupted tract of semi-natural chalk grassland in Britain, a habitat which has declined by more than 80% in the last 50 years. As well as the grassland, the site supports large areas of mixed scrub, including juniper, and broadleaved, mixed and coniferous woodland.


Porton locator map

Site boundary and location map


Sarah Atkinson

Defence Science and Technology Laboratory
Dstl Porton, Porton Down, Salisbury, Wiltshire, SP4 0JQ