Green Lake (Grüner See)
Tragöß, Styria, Austria
Green Lake is a seasonal natural phenomenon in the Austrian Alps where spring snowmelt transforms a modest mountain lake into a vast, crystal-clear body of water.…
What it's like here
Green Lake is a seasonal natural phenomenon in the Austrian Alps where spring snowmelt transforms a modest mountain lake into a vast, crystal-clear body of water. The submerged park—complete with grass, benches, and trees—becomes visible beneath the surface, creating a surreal underwater landscape that attracts divers and photographers. The lake sits in a protected area with strict environmental rules, and the transformation typically peaks in late spring (May–June).
What makes this place so striking is the sheer oddness of it. In winter and early spring, it's a small, ordinary alpine lake. But as temperatures rise and snow melts from the surrounding peaks, the water level climbs dramatically, swallowing the park whole. You stand on the shore looking down into perfectly transparent water and see a complete landscape—grass, pathways, park furniture—as if frozen in time below the surface.
Diving here is popular among experienced divers, though it requires a permit and the water stays cold year-round. The clarity of the water makes photography compelling, and many visitors come simply to walk around the edge and absorb the strangeness of it. The lake is free to visit, with parking and toilets available. A visit typically takes one to two hours, or up to half a day if you want to explore thoroughly.
Highlights
- The lake expands dramatically during spring snowmelt, completely submerging the surrounding park
- Crystal-clear water reveals grass, benches, trees, and pathways beneath the surface
- Popular destination for experienced divers with the proper permits
- Peaks in late May and June when water clarity and depth are greatest
- Free entry with parking and basic facilities available
Good to know
The submerged park is best seen in late spring (May–June). Diving requires experience and a permit due to the cold water and strong currents. The lake is a protected area with environmental restrictions in place. The water remains very cold even in summer. It is accessible by car from Graz.
You might also like
Questions people ask
When is the best time to visit Green Lake?
Late spring (May–June) is ideal, when the snowmelt has brought the water to its highest level and clarity is greatest.
Can you swim or dive in Green Lake?
Diving is possible for experienced divers with the required permit, but the water is very cold and currents are strong. Swimming is permitted, though conditions are demanding.
What makes this lake unusual?
Each spring, snowmelt causes the lake to expand dramatically and flood the surrounding park. The crystal-clear water allows you to see the submerged landscape—grass, benches, and trees—beneath the surface.
Attributes & facilities
Experience
Last verified: August 22, 2026