reykjanes · Iceland
Grænavatn
Grænavatn, meaning 'Green Lake,' captivates with its astonishingly vivid blue-green waters, a striking contrast against the dark, volcanic hills of the Reykjanes Peninsula. This unique crater lake offers a serene yet powerful glimpse into Iceland's raw geological beauty and vibrant natural palette.
About Grænavatn
Grænavatn, meaning 'Green Lake,' captivates with its astonishingly vivid blue-green waters, a striking contrast against the dark, volcanic hills of the Reykjanes Peninsula. This unique crater lake offers a serene yet powerful glimpse into Iceland's raw geological beauty and vibrant natural palette.
History & Background
Grænavatn's history is deeply rooted in Iceland's volatile geological past. The lake occupies a crater formed by a phreatic eruption, a powerful explosion that occurs when superheated water flashes to steam. Such eruptions are common in geothermally active areas like Reykjanes, where rising magma meets underground water sources. Over millennia, this crater filled with water, which then dissolved minerals from the surrounding volcanic rock and geothermal vents. The distinctive color of Grænavatn is a direct testament to this geological process. The water's high concentration of sulfur, silica, and other geothermal minerals gives it its striking, almost fluorescent blue-green hue. Unlike many lakes, its color isn't primarily from algae but from suspended mineral particles and their interaction with light. This makes Grænavatn a living laboratory of geological processes, constantly evolving and showcasing the raw, powerful forces that continue to shape the Icelandic landscape.
Did You Know?
- ✔Grænavatn translates to 'Green Lake,' despite its prominent blue-green color.
- ✔It is a crater lake, formed by a phreatic explosion when magma met groundwater.
- ✔The vivid turquoise color is due to high concentrations of sulfur and geothermal minerals.
- ✔Located on the Reykjanes Peninsula, a UNESCO Global Geopark.
- ✔The lake is relatively deep, reaching up to 20 meters in some parts.
Tours Near Grænavatn
Best-rated Iceland experiences — book with free cancellation
Glacier Adventure at Sólheimajökull Private Tour
From $384.67
Book Now
2 hour Round Trip in Vestmannaeyjar on a RIB Boat
From $242.64
Book Now
Diamond Beach & Jökulsárlón Floating Glacier Guided Day Tour
From $1763.55
Book NowAbout Grænavatn
Grænavatn, translating to 'Green Lake,' is a mesmerizing natural attraction on Iceland's Reykjanes Peninsula, renowned for its unusually vibrant blue-green waters. This stunning crater lake is a result of a phreatic explosion, where magma interacted with groundwater, leaving behind a deep, circular basin filled with mineral-rich water. The vivid turquoise color, clearly depicted in the image, is attributed to the lake's high sulfur content and geothermal minerals, which brilliantly reflect sunlight. Visitors can easily reach Grænavatn, often enjoying a peaceful stop amidst the rugged, lava-strewn landscape. The surrounding hills, a mix of earthy browns and sparse greens, provide a stark yet beautiful contrast to the lake's intense color. It's an ideal spot for photography, offering incredible vistas of Iceland's raw, untamed nature. While there are no specific facilities, the site encourages quiet contemplation of its unique geological formation. A short walk around parts of the lake's edge allows for different perspectives of its shimmering surface and the clear, shallow areas where the rocky bottom is visible. It's a prime example of the diverse and dynamic landscapes that make the Reykjanes Peninsula a UNESCO Global Geopark. Remember to respect the fragile environment and leave no trace behind.
Private Tour: South Coast of Iceland by SUV or Van from Reykjavik
From $820
Book Now
Fast-Paced Glacier Snowmobile Adventure from Gullfoss
From $437.93
Book Now
Private Golden Circle Tour from Reykjavik
From $695
Book NowHistory & Background
Grænavatn's history is deeply rooted in Iceland's volatile geological past. The lake occupies a crater formed by a phreatic eruption, a powerful explosion that occurs when superheated water flashes to steam. Such eruptions are common in geothermally active areas like Reykjanes, where rising magma meets underground water sources. Over millennia, this crater filled with water, which then dissolved minerals from the surrounding volcanic rock and geothermal vents. The distinctive color of Grænavatn is a direct testament to this geological process. The water's high concentration of sulfur, silica, and other geothermal minerals gives it its striking, almost fluorescent blue-green hue. Unlike many lakes, its color isn't primarily from algae but from suspended mineral particles and their interaction with light. This makes Grænavatn a living laboratory of geological processes, constantly evolving and showcasing the raw, powerful forces that continue to shape the Icelandic landscape.
Story & Folklore
Nestled within the dramatic Reykjanes Peninsula, Grænavatn emerges as a vibrant testament to Iceland's fiery past. Legend whispers that this 'Green Lake' was formed not by water, but by the tears of a heartbroken giantess, whose sorrow stained the volcanic basin with an impossible hue of blue and green. In reality, this stunning crater lake is a geological marvel, born from a phreatic eruption where rising magma met groundwater, carving out the basin over millennia. Its captivating turquoise waters, visible in the image, are a direct result of the rich mineral deposits, particularly sulfur, from the surrounding geothermal activity. Standing on its rocky shores, with the ancient, weathered mountains as a backdrop and the clear blue sky overhead, one can almost feel the earth's restless energy that sculpted such a breathtaking landscape, a place where the planet's pulse is vividly on display.
Visitor Information
Best Time
Late Morning to Mid-afternoon (for best light on water), Summer
Duration
30-45 minutes
Access
Paved road, short walk from parking
Why Visit
Witness the mesmerizing, otherworldly turquoise hues of Grænavatn, a true spectacle of nature's artistry.
Did You Know?
Grænavatn's distinctive turquoise color is due to the high concentration of sulfur and geothermal minerals dissolved in its waters, reflecting the light uniquely.
The Giantess's Tears of Grænavatn
Local folklore tells of a heartbroken giantess who wept tears of sorrow so profound that they filled this volcanic crater. Her grief was so immense that it infused the waters with an ethereal blue-green hue, a permanent reminder of her deep sadness and the raw emotion imprinted upon the land.
Hidden Gems Nearby
Krýsuvík Geothermal Area
Just a short drive from Grænavatn, explore bubbling mud pots, steaming vents, and vibrant mineral deposits at Seltún in Krýsuvík.
It offers a dramatic, sensory experience of Iceland's active geothermal forces and colorful landscapes.
Kleifarvatn Lake
Iceland's largest lake on the Reykjanes Peninsula, Kleifarvatn is known for its deep blue waters and mysterious, often changing, water levels linked to seismic activity.
Its vastness and dramatic surroundings provide a beautiful contrast and further insight into the region's geology.
Practical Information
Best Time
Late Morning to Mid-afternoon (for best light on water), Summer
Duration
30-45 minutes
Access
Paved road, short walk from parking
Frequently Asked Questions
Is there an entry fee for Grænavatn?▾
No, there is no entry fee to visit Grænavatn. It is freely accessible to the public.
Is parking available at Grænavatn?▾
Yes, there is a designated parking area near Grænavatn, usually a short walk from the viewpoint.
Can I swim in Grænavatn?▾
Swimming in Grænavatn is generally not recommended due to the high mineral content and cold temperatures. It's best to admire its beauty from the shore.
What should I bring when visiting Grænavatn?▾
Bring warm, waterproof layers, sturdy walking shoes, and a camera to capture the lake's unique colors. Binoculars can enhance distant views.
Is Grænavatn wheelchair accessible?▾
The main viewpoint is generally accessible with some uneven terrain. However, walking closer to the water's edge involves rocky paths that may not be suitable for wheelchairs.