| Site of Special Scientific Interest | |
 The eastern portal of the tunnel | |
| Location | Hampshire |
|---|---|
| Grid reference | SU 713 516[1] |
| Interest | Biological |
| Area | 0.4 hectares (0.99 acres)[1] |
| Notification | 1985[1] |
| Location map | Magic Map |
 Inside the Greywell Tunnel | |
| Overview | |
|---|---|
| Location | Greywell |
| Coordinates | 51°15′38″N 0°58′44″W / 51.2605°N 0.978849°W |
| OS grid reference | SU713517 |
| Status | Disused (collapsed) |
| Waterway | Basingstoke Canal |
| Operation | |
| Constructed | brick |
| Opened | 1794 |
| Closed | 1932 |
| Technical | |
| Length | 1,230 yards (1,120 m) |
| Towpath | no |
| Boat-passable | no |
Greywell Tunnel is a disused tunnel on the Basingstoke Canal near Greywell in Hampshire, which is now a 0.4-hectare (0.99-acre) biological Site of Special Scientific Interest.[1][2]
- ^ a b c d "Designated Sites View: Greywell Tunnel". Sites of Special Scientific Interest. Natural England. Retrieved 11 May 2020.
- ^ "Map of Greywell Tunnel". Sites of Special Scientific Interest. Natural England. Retrieved 11 May 2020.