Limnos Volcanic Reef
Dive site
Limnos sits on a volcanic arc, and its seafloor reflects this origin in dramatic basalt columns and lava tube formations that descend in broken steps from 5 to 30 metres. Visible gas seeps at 18 to 22 metres — CO2 bubbling from fissures — create localised low-pH micro-environments that have attracted scientific interest as natural ocean acidification analogues. The volcanic rock substrate hosts a different sponge community to carbonate reefs, with yellow tube sponges and encrusting cup corals (Caryophyllia spp.) dominant. Dense sea urchin populations maintain algal clearings between the basalt columns. Visibility is excellent year-round due to the island's position in an area of strong tidal mixing at 18 to 22 metres.
Conditions
Depth
5 to 32 m
Advanced depths
Current
Usually gentle
Can pick up on the edge
Visibility
18 to 25 m
Clearest in the calm season
Water
12 to 28°C
3mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 13 | 12 | 13 | 15 | 18 | 22 | 24 | 25 | 23 | 20 | 16 | 13 |
| Vis (m) | 12 | 12 | 14 | 15 | 18 | 18 | 18 | 18 | 18 | 15 | 12 | 12 |
| Current | Moderate | Moderate | Moderate | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Moderate | Moderate | Moderate |
Your chances of seeing each animal
Yellow tube sponge
Sometimes
About 1 in 3 dives
Purple sea urchin
Sometimes
About 1 in 3 dives
Mediterranean moray
Photo: frahome · CC BY-NC
Sometimes
About 1 in 3 dives
Painted comber
Photo: Luis P. B. · CC BY-NC
Sometimes
About 1 in 3 dives
Field journal
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