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Þingvallavatn

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Þingvallavatn is the largest natural lake in Iceland, situated within the Þingvellir National Park about 40 kilometers east of Reykjavík. Spanning 84 square kilometers, the lake reaches a maximum depth of 114 meters. Geologically, it is uniquely positioned directly on the rift valley between the North American and Eurasian tectonic plates. The lake's water is exceptionally clear, as much of it originates from the Langjökull glacier and is filtered through underground lava rock for decades before reaching the basin. This extreme clarity makes the lake, particularly the Silfra fissure, one of the world's premier destinations for diving and snorkeling. Biologically, Þingvallavatn is famous for its four distinct morphs of Arctic char, which have evolved in relative isolation since the end of the last ice age. The northern shore is home to the historical site of the Alþingi, the world's oldest surviving parliament, which was established here in the year 930 AD.
- Location: Iceland
- Nearby: Laugarvatn (19 km)
Best time to visit & climate
The most pleasant time to visit is Jun–Aug.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | -1 | -1 | 0 | 3 | 6 | 9 | 11 | 10 | 8 | 4 | 1 | -1 |
| Rain mm | 179 | 162 | 161 | 123 | 96 | 86 | 105 | 121 | 184 | 149 | 149 | 182 |
📋 Practical info
Geography
Facts
- Largest natural lake in Iceland
- Area of 84 square km
- Maximum depth of 114 meters
- Located on the Mid-Atlantic Ridge
- Home to four morphs of Arctic char
- Contains the famous Silfra fissure
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
© OpenStreetMap contributors · OpenRouteService
Sights nearby
Frequently asked questions
How large is the lake?
What is the Silfra fissure?
Is fishing allowed in the lake?
Does the lake belong to the national park?
Why is the water so clear?
Þingvallavatn: where is it located?
Þingvallavatn: when is the best time to visit?
Þingvallavatn: why is it worth visiting?





















