Les Hanois Reef
Dive site
Les Hanois is a chain of exposed granite rocks off Guernsey's southwest tip, guarded by a Victorian lighthouse that has marked one of the English Channel's most dangerous passages for 160 years. Below the surface the rock ridges and surge channels plunge to over 30 metres, their walls packed with dead men's fingers, jewel anemones, and plumose anemones. The Atlantic swell drives strong, nutrient-loaded current that feeds large pollack, coalfish, and grey mullet in mid-water. Spider crabs are abundant in spring. The site demands boat access and a careful weather window — it is exposed and the tidal flow is fierce — but the payoff is one of Guernsey's most dramatic seascapes.
Conditions
Depth
6 to 32 m
Advanced depths
Current
Can be moderate
Can pick up on the edge
Visibility
8 to 18 m
Clearest in the calm season
Water
9 to 18°C
5mm or 7mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 9 | 9 | 9 | 10 | 12 | 15 | 16 | 16 | 15 | 13 | 11 | 9 |
| Vis (m) | 5 | 5 | 6 | 6 | 8 | 8 | 8 | 8 | 7 | 6 | 5 | 5 |
| Current | Strong | Strong | Strong | Moderate | Moderate | Moderate | Gentle | Gentle | Moderate | Strong | Strong | Strong |
Field journal
No sightings recorded here yet.
Upload the first sightingDived here recently?
Your sighting helps us track reef health at this site in real time.
Submit a sightingPlanning to dive Les Hanois Reef?
Your underwater photos help scientists track reef health here in real time.
What to photograph: fish and marine life, coral (especially anything pale or unusual), anything unexpected.
How to capture it: shoot JPEG, keep location on, note your depth and the date.
Dived Les Hanois Reef recently?
Your photos help track reef health.
Up to 10 photos · JPEG or PNG · max 20 MB each
📷
Drag photos here, or tap to select
GPS in your photo will auto-detect the dive site
Gear