Þingvellir National Park, Iceland
Silfra
Freshwater rift fissure in a national park, filled with filtered glacial meltwater at 2-4C year-round, dived for extreme visibility and the tectonic setting rather than for marine life.
- Formations
- Freshwater
Season
- Best months
- Best May–Sep
- Minimum cert
- Open Water
- Water
- 2–4°C
- Current
- mild
For your trip
How Silfra fits your trip
When
My cert
On my mind
Pick a month and your certification to see how Silfra fits — what works, and what to watch for before you book. Add what's on your mind and the record's own words on it appear here.
Where Claude is switched on, what you type is sent to Anthropic to be read. Sightline doesn't keep it.
Season
When this place works
Open year-round; the water is 2-4C in every month so there is no thermal season. Winter access depends on the road to Thingvellir and on daylight, not on the site.
Why dive here
What this place is known for
01formationMid-Atlantic rift fissure
The fissure is a crack in the plate boundary between the North American and Eurasian plates, dived as four connected sections: Big Crack, Hall, Cathedral and Lagoon. The 'diving between two continents' framing is what sells the site and it is loosely true,…
- 02freshwater
Glacial meltwater visibility
Mild surprise relative to the headline: people book for the tectonic story and come back talking about the water. Meltwater filtered through lava for decades before surfacing, producing horizontal visibility reported at over 100 metres, plus bright green…
Marine life
Twelve-month species timelines
Rarely seen. Reported to enter the fissure around the Aug-Sep spawning period. Single operator source; unverified.
A 2-10cm dwarf morph is described as resident in the Þingvallavatn system. Present year-round but very rarely noticed by divers, hence 'off' throughout rather than 'peak'. Single operator source;…
Conditions
What the water is like
Water temp
2–4°C
15°C — 32°C
Visibility
80–120 m
0 m — 40 m
Current
mild
mild — strong
Thermoclines
Not typical
unlikely
Minimum certification — Open Water
The certification field understates the real barrier. Þingvellir National Park requires an autonomous-diver-equivalent certification PLUS a drysuit certification, or documented proof of 10 drysuit dives within the past two years verified…
Entries — shore
Recommended & required
- drysuit — required. Hard gate. Thingvellir National Park requires a drysuit certification, or documented proof of 10 drysuit dives within the past two years verified by an instructor. Operators will not issue without it. Wetsuits are prohibited for divers.
Logistics
How people dive it
1 day
scuba
Half to full day from Reykjavík, typically two dives of 30-40 minutes with a surface interval. Guide ratio is capped at 3 divers.
1 day
snorkel
Format mismatch warning, and the most important field in this record. The overwhelming majority of Silfra visitors snorkel, not dive.…
Operators
Who to book with
Loading operators…
Sources
Where this comes from.
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