Why? The lake is the result of the mountains' heavily snowcapped peaks, which begin to melt as the Styria region's temperature rises each spring, sending streams of ice-cold, sparkingly clear water into the basin below. The lake's striking and definitive hue is a byproduct of the chlorophyll-rich grass and foliage that it progressively engulfs. By June the water levels can reach up to ten metres in depth, making this the most popular month for diving expeditions before the waters begin to recede.
Created by the combination of blue and yellow, green is the colour of immortality, its connotations being those of Springtime, regeneration and new life. It is the colour of hope, strength and longevity, but also of acidity. It is the colour of water (although not normally to the Green Lake's degree), as red is the colour of fire, and thus the two are often considered to have a strong relationship to each other; indeed they are complementary colours on the colour spectrum.