Depth of Australia’s Deepest Lake Revealed

A view across Lake St Clair as CSIRO’s RV South Cape returns from a survey, supporting environmental surveying in Tasmania’s remote wilderness. Matt Marrison/CSIRO

A high-tech sonar device and eight days of hard work in wild weather has solved the mystery of Australia’s deepest lake.

The exact depth of Lake St Clair in Tasmania’s picturesque Central Highlands has previously been unknown, with guesses ranging from 160 to 215 metres.