| Site of Special Scientific Interest | |
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 Location of Halnaker Chalk Pit. | |
| Area of search | West Sussex |
|---|---|
| Grid reference | SU 921 089 |
| Interest | Biological |
| Area | 6.4 hectares (16 acres) |
| Notification date | 1992 |
| Location map | Magic Map |
Halnaker Chalk Pit is a 6.4-hectare (16-acre) biological Site of Special Scientific Interest north-east of Boxgrove in West Sussex.
This chalk pit is important as it has about 50% of the British population of a nationally rare and vulnerable plant, broad-leaved cudweed. Other plants include hoary plantain, scarlet pimpernel, bent grass, yellow-wort and autumn gentian.
The site is private land with no public access.
