This is the Green Lake, situated in Tragoess, Styria, Austria. The lake sits at the foot of the snow capped Hochschwab mountains. in the wintertime, the lake is almost nonexistent and the area is used as a park. In the springtime the ice and snow on the mountains melts, and this melt-water fills the basin below. The park is filled with this ice cold, almost crystal clear water. The lake looks green in colour due to the foliage beneath.