Grænavatn lake Reykjanes Peninsula
- Einar Páll Svavarsson
- 5 days ago
- 2 min read

Admission to Grænavatn Lake is free
Visitors to Grænavatn Lake are not required to make any payment for entry. Despite the limited capacity of the parking area, it generally accommodates the number of visitors adequately without reaching full capacity. Restrooms and sanitary facilities are not provided at this natural attraction.
Located just a short distance south of the Geothermal area Seltún at Krísuvík, Grænavatn (Greenlake) is a fascinating natural wonder waiting to be explored. This small lake, nestled within a volcanic crater, stands out for its striking green hue, a result of the high sulfur content present in its waters. Measuring only a few hundred meters in diameter, Grænavatn provides an enchanting setting for a leisurely stroll, with a well-defined trail that encircles the lake in just about 20 minutes. Despite its modest size, the lake boasts a surprising depth of 45 meters, offering a glimpse into the geological forces that shaped its formation. Standing at the edge of the crater, visitors can witness the color gradient along the shoreline, a visual testament to the lake's depth variations.

Geologists regard Grænavatn as a remarkable geological anomaly in Iceland, highlighting its significance as a natural phenomenon worth studying and admiring. The juxtaposition of vibrant green waters against the rugged volcanic landscape creates a captivating scene that showcases the dynamic forces at play beneath the Earth's surface. As visitors explore this unique site, they can immerse themselves in the wonders of Icelandic geology and gain a deeper appreciation for the intricate processes that have shaped the country's diverse landscapes.

A failed venture at Grænavatn that almost destroyed the lake

Many visitors are curious about the two silage towers and the deteriorating cowhouse near the lake. This project was one of those unfortunate endeavors launched at a time when understanding of nature was limited, and economic interests often overshadowed respect for natural wonders. Although it took place in the 1950s, not that long ago, the project nearly destroyed the lake as some of its surroundings were altered. Needless to say, the venture failed, and those responsible, including the Hafnarfjörður municipality, have yet to remove this unsightly structure and restore the area around the lake.
Grænavatn and folklore

Because of its unique characteristics and color, the lake has inspired folklore tales for centuries. It wasn't until the mid-16th century that an unusual creature was reportedly seen emerging from the lake. The lake is located near the main road Krísuvíkurvegur (42) and is visible just a few hundred meters from Seltún, the geothermal area.
If you're planning to tour Iceland in a rental car, make sure to read this article about the type of car that would be best for your trip.
Location of Grænavatn crater Reykjanes Peninsula on the map of Iceland
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