Article · Wikipedia archive · Last revised Aug 3, 2026

Portsdown

Portsdown is a 69.1-hectare (171-acre) biological Site of Special Scientific Interest on Portsdown Hill, on the northern outskirts of Portsmouth in Hampshire.

Last revised
Aug 3, 2026
Read time
≈ 1 min
Length
132 w
Citations
6
Source
Wikipedia ↗
Portsdown
Site of Special Scientific Interest
Map
Location of Portsdown.
LocationHampshire
Grid referenceSU 640 0651
InterestBiological
Area69.1 hectares (171 acres)1
Notification19841
Location mapMagic Map

Portsdown is a 69.1-hectare (171-acre) biological Site of Special Scientific Interest on Portsdown Hill, on the northern outskirts of Portsmouth in Hampshire.12

This is a linear south-facing escarpment with a rich chalk grassland flora. The diverse insect fauna includes all the chalk downland butterflies and a population of the largest British bush cricket, Tettigonia viridissima. On the lower slopes, raised beaches indicate former sea levels.3

References

References

  1. "Designated Sites View: Portsdown". Sites of Special Scientific Interest. Natural England. Retrieved 17 May 2020.
  2. "Map of Portsdown". Sites of Special Scientific Interest. Natural England. Retrieved 17 May 2020.
  3. "Portsdown citation" (PDF). Sites of Special Scientific Interest. Natural England. Retrieved 17 May 2020.

50°51′14″N 1°05′31″W / 50.854°N 1.092°W / 50.854; -1.092