Incredibly cold water, on an amazingly hot day, with huge, dopey flies lolloping around your face. 1900metres above sea level, and one of only four cirque lakes in mainland Australia. Formed by glacial gouging of the granite rock. The lake is one of the purest freshwater lakes in the country. In winter it is a popular site for ice climbing.
I'm pretty sure that because of its environmental sensitivity, swimming is not allowed. A number of threatened plant and invertebrate species that are restricted to alpine areas are found here.