Grüner See, a park that turns into a lake in summer

Gruner See, lac vert, Tragoss, Autriche

Ephemeral diving at Grüner See lake in Austria, where divers can only visit in June and July!

Grüner See, literally « green lake », is a lake in the Austrian state of Styria, near the town of Tragöß, at the foot of the snow-capped Hochschwab mountains. In winter, the lake is only 1 or 2 meters deep, and its surroundings serve as a nature park. It’s a particularly popular spot for hikers. But when the temperature starts to rise in spring, the ice and snow on the mountain peaks begin to melt and the water flows into the basin just below. The basin then fills with water, flooding the surrounding area, including the park. During the summer, the lake reaches its maximum depth of around 12 metres, and is said to be at its most beautiful – not only to see, but also to snorkel.

Gruner See, lac vert, Tragoss, Autriche

The lake owes its characteristic green color (as well as its name) to the grass and foliage at the bottom of the water, and thanks to the melting of fresh snow, the icy water is crystal clear. The temperature of the lake is rather cold, from 4 to 8°C, but it is very popular with divers, who can observe the green meadows at the edge and bottom of the lake, especially in June, when the water is at its highest. Alpine vegetation and meadow flowers are visible in full bloom underwater (!) You can even see benches, a bridge and footpaths.

From July onwards, the lake’s water level begins to recede. As winter approaches, the lake returns to its original size and the park is once again a great place for hikers.

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And here’s a video of diving in Grüner See lake:

Photo sources: Amusing Planet, CitizenPost, Wikipedia