The lake is filled with water due to melting snow on the surrounding mountain slopes. This process is gradual, and the water is immaculate. Throughout the year, the water is cold (5-6 ° C), and its level is highly dependent on the season. The highest watermark is reached at the beginning of summer, then the lake is in its real beauty, with depth along the coast of about 10 meters. In the autumn, it dries almost completely. At this time, meadows with hiking trails and benches again emerge to the surface from under emerald water.
Grüner See is rightfully considered one of the wonders of Austria. The lake is often called the Emerald Lake because of the special shade of its water. Hiking trails of different lengths and difficulties are arranged along the shores of the lake. Stunning views are along these trails. Diving on the lake is one of the most unusual tourist attractions in Austria.