
Austria's Green Lake, also known as Grüner See, is a magical, emerald-toned lake in the Hochschwab mountains of Styria, near the village of Tragöß. The lake is a hiker's and scuba diver's dream, with its green meadows, underwater bridge and bench, and submerged trails and trees. The unique colour of the lake is due to a combination of factors, including the reflection of blue-green light by finely eroded rock suspended in the water and the presence of green algae. During the winter, the lake transforms into a shallow pond, but as temperatures rise in the spring, snowmelt from the surrounding mountains fills the basin, creating a majestic underwater oasis.
| Characteristics | Values |
|---|---|
| Lake colour | Emerald green |
| Location | Styria, Austria |
| Nearby places | Hochschwab Mountains, Tragöß village |
| Water temperature | 6-7 °C (43-45 °F) |
| Depth | 3-7 feet deep in winter, up to 36 feet in spring |
| Scenery | Snowmelt from mountains, forest groves, trails, benches, footbridge |
| Activities | Hiking, scuba diving, swimming |
| Restrictions | No watersports allowed |
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What You'll Learn
- The Green Lake's colour is due to a combination of factors, including the reflection of blue-green light and the presence of green algae
- The lake is located in the Hochschwab Mountains of Styria, near the village of Tragöß
- During the winter, the lake is only a few meters deep and the surrounding area is used as a park
- In the spring, as temperatures rise, snow from the mountains melts into the basin, causing the lake to expand and reach a maximum depth of 12 meters
- The Green Lake is a popular destination for divers and swimmers, who can explore underwater trails, trees, benches, and bridges

The Green Lake's colour is due to a combination of factors, including the reflection of blue-green light and the presence of green algae
The Green Lake (Grüner See) in Styria, Austria, is known for its emerald-green colour, which is the result of a combination of factors. Firstly, the pure water of the lake absorbs red light, appearing blue-green. Finely eroded rock suspended in the water reflects the blue-green light, intensifying the colour. Additionally, the presence of green algae in parts of the lake contributes to its distinct hue.
The Green Lake is a "seasonal" lake, with its ecosystem changing annually. During the winter, the lake is more like a shallow pond, with water levels ranging from 3 to 7 feet deep. As spring arrives and temperatures rise, snow and glaciers from the surrounding Hochschwab Mountains melt, causing water levels to rise significantly. This melting water penetrates the ground and flows into the lake basin, resulting in a maximum depth of 12 meters in June, when the lake is at its peak.
The unique colour of the lake, combined with its seasonal transformation, has made it a popular destination for hikers and scuba divers. Visitors are drawn to the opportunity to explore the underwater world, which includes submerged trees, benches, paths, bridges, and even a small footbridge. The lake's colour and the chance to dive among the green meadows and blossomed flowers have attracted many tourists, especially divers, making it a hotspot for underwater exploration.
However, the increased tourism and human activity posed a risk to the lake's delicate ecosystem and vibrant colour. In 2016, the local tourism office took proactive measures to protect the lake by officially prohibiting all watersport activities, including diving, swimming, and boating. The decision was made after consulting experts who determined that sediment disturbance could potentially pollute the water and alter its colour. As a result, the lake can now only be experienced from the surface, preserving its magical appearance for future generations.
The Green Lake's colour is, therefore, a result of the interplay between the absorption and reflection of blue-green light by the pure water and eroded rock, respectively, as well as the presence of green algae. The seasonal changes in water levels and the subsequent flooding of the surrounding area further contribute to the lake's allure, creating a unique and dynamic natural wonder.
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The lake is located in the Hochschwab Mountains of Styria, near the village of Tragöß
The Green Lake, or Grüner See, in Styria, Austria, is located near the village of Tragöß in the Hochschwab Mountains. The lake is a popular destination for locals and tourists, especially during the summer. The lake is known for its emerald colour, which is a result of several factors. The pure water of the lake absorbs red light, giving it a blue-greenish hue. Finely eroded rock suspended in the water reflects the blue-green light, enhancing the colour. Additionally, the growth of green algae in parts of the lake contributes to its distinctive colour.
The Hochschwab Mountains are a mountain range in the Northern Limestone Alps of Austria, with the highest peak, also called Hochschwab, reaching 2,277 metres above the Adriatic. The mountains are located in the eastern part of the Northern Alps, in the Austrian state of Styria. The range covers an area of about 400 km² and is known for its extensive limestone plateau. The summit of Hochschwab is a flat, rock and grass-covered dome that can be easily climbed from the Schiestlhaus, located at 2,153 metres above sea level. The Schiestlhaus is a mountain hut that accommodates overnight guests, offering dormitory and private rooms with basic amenities.
The Green Lake is surrounded by the Hochschwab Mountains and forests, providing a stunning backdrop for visitors. The lake is easily accessible, with well-marked trails and good infrastructure. There is a large car park and a gravel road leading to the lake that is suitable for those on foot. The area offers a variety of trails for visitors to explore, including options near the water's edge and through the surrounding forests. The lake is also a popular spot for divers due to its unique colour and clear waters.
However, in recent years, the local tourism office has had to prohibit all watersport activities in the lake to protect its vibrant colour. The decision was made after consultations with experts, who determined that stirred-up sediment could potentially pollute the water and alter its appearance. Despite this restriction, the lake remains a beautiful destination, attracting photographers and nature enthusiasts alike. The best time to visit the lake is during spring or early summer, when the snowmelt from the surrounding mountains fills the lake basin, creating a picturesque setting.
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During the winter, the lake is only a few meters deep and the surrounding area is used as a park
The Green Lake in Austria is a unique natural wonder. Its depth varies with the seasons, from a shallow pond in winter to a deep lake in spring and summer. During the winter, the lake basin is only a few metres deep, and the surrounding area is used as a park. This makes it a perfect spot for a leisurely walk in the woods. As the snow melts in the spring, the basin fills with water, and the area is transformed into a majestic underwater oasis. The lake reaches its peak in June, when it can be as deep as 12 metres, and it is a stunning sight to behold.
The Green Lake, also known as Grüner See, is located in the Hochschwab Mountains of Styria, near the village of Tragöß. The surrounding area is characterised by forests and mountains, providing a picturesque backdrop for the lake. The lake's emerald colour is a result of several factors, including the reflection of light, the presence of finely eroded rock, and the growth of green algae in parts of the lake.
As the lake's popularity grew, the local tourism office took steps to protect it by prohibiting all watersport activities in 2016. This decision was made to preserve the lake's vibrant colour and ecosystem. Despite the restrictions, the lake remains a popular destination for hikers and nature enthusiasts. The trails around the lake offer varied perspectives and excellent opportunities for photography.
The Green Lake is a true seasonal lake, with its ecosystem and appearance changing throughout the year. It serves as a reminder of nature's beauty and its ability to surprise and delight us with its phenomena. The transformation of the lake from a winter park to a summer underwater haven is a testament to the dynamic nature of our planet.
With its accessibility and well-developed infrastructure, the Green Lake has become a favourite spot for many. The combination of natural beauty, easy access, and the unique opportunity to explore an underwater world continue to draw visitors to this magical place. The Green Lake is a hidden gem, offering a peaceful retreat and a chance to connect with nature in a whole new way.
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In the spring, as temperatures rise, snow from the mountains melts into the basin, causing the lake to expand and reach a maximum depth of 12 meters
The Green Lake in Austria, also known as Grüner See, is located in the Hochschwab Mountains of Styria, near the village of Tragöß. It is a unique and picturesque spot that transforms with the seasons. During the winter, the lake basin holds a shallow pond, only 3 to 7 feet deep, and the surrounding area is used as a park for hiking and relaxation.
As spring arrives and temperatures begin to climb, snow from the mountains melts and flows into the basin. This snowmelt causes the lake to expand significantly, flooding the surrounding trails, trees, benches, and even a footbridge. The lake's depth increases to a maximum of 12 meters, and its colour takes on a striking emerald green hue.
The emerald tone of the lake is a result of several factors. Firstly, pure water absorbs red light, giving it a blue-greenish appearance. Additionally, finely eroded rock suspended in the water reflects the blue-green parts of the light, enhancing this colour. Lastly, the growth of green algae in certain parts of the lake contributes to its vibrant and magical colour.
The lake is most impressive during this time, as it offers a unique underwater world to explore. Between spring and early summer, divers and swimmers can immerse themselves in this majestic setting, swimming among the trees, paths, and bridges. The play of light underwater adds to the captivating atmosphere.
However, as summer progresses, the lake begins to diminish. By the end of July, it returns to its previous state as a normal mountain basin, still beautiful but with the secret underwater world now hidden, waiting for the snowmelt to reveal it once more in the next spring.
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The Green Lake is a popular destination for divers and swimmers, who can explore underwater trails, trees, benches, and bridges
The Green Lake, or Grüner See, is a popular destination for divers and swimmers, who can explore underwater trails, trees, benches, and bridges. The lake is located in the Hochschwab mountains of Styria, Austria, near the village of Tragöß. It is known for its emerald-green colour, which is caused by the reflection of blue-green light in the water, as well as the presence of green algae. The lake is fed by snowmelt from the surrounding mountains, resulting in clear water with a blue-greenish hue.
During the winter and spring, the water levels in the lake are relatively low, revealing a picturesque park with lush meadows and benches. As the snow melts in the spring, the water levels begin to rise, and the park's walking paths, bridges, and trees become submerged. This underwater landscape creates a surreal and enchanting atmosphere, attracting divers and swimmers who can explore the submerged features. The crystal-clear waters offer excellent visibility, often exceeding 30 meters, providing a unique opportunity for divers to swim alongside benches, meadows, and trees in an underwater world.
The prime time to explore the underwater beauty of Green Lake is from May to June when the water levels are at their highest. During this period, divers can fully immerse themselves in the submerged landscape, witnessing the transformation of the park beneath the surface. However, it is important to plan dives according to water levels and weather conditions to ensure safety. The unique juxtaposition of nature and human elements, such as swimming past park benches covered in algae, creates a surreal diving experience.
While the lake is a popular destination for divers and swimmers, there have been efforts to restrict water activities to preserve the delicate ecosystem. In 2016, the local tourism office prohibited all watersport activities, including diving, swimming, and boating, to prevent the negative impact of stirred-up sediment on the lake's vibrant colour. Despite the restrictions, Green Lake remains a stunning destination, offering hikers and photographers the opportunity to capture its magical beauty from the surface.
The Green Lake is a remarkable natural wonder, offering a unique experience for those who venture into its waters or explore its surrounding trails. With its clear emerald waters, submerged features, and enchanting atmosphere, it continues to captivate and inspire those who visit.
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Frequently asked questions
The colour of Austrian lakes is due to a combination of factors. Pure water absorbs red light and appears blue-green. Finely eroded rock suspended in the water reflects blue-green light, and green algae contribute to the colour as well.
Green Lake, or Grüner See, is a lake in the Styria region of Austria, near the village of Tragöß. It is known for its emerald colour and the fact that it disappears in the winter.
During the winter, Green Lake is more like a shallow pond, reaching a depth of only 3 to 7 feet. As temperatures rise in the spring, snow from the surrounding mountains melts and fills the basin, flooding trails, benches, and even a footbridge.
Swimming and diving were previously allowed in Green Lake, but these activities are now prohibited. The local tourism office made this decision to prevent the risk of stirred-up sediment polluting the lake's vibrant colour.











































