Officially, Green Lake is a karst lake in Styria in the municipality of Trages-Sankt Katherine in the Oberort district. It is located on the south side of the Hochschwabgruppe massif. In late summer - early fall, the water in the lake reaches its lowest point.
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.