It has an area of approximately 45 square kilometres (17 sq mi), and a maximum depth of 215 metres (705 ft), making it Australia's deepest lake.

Lake St Clair is located on the edge of the Big River Tasmanian Aboriginal nation, and there is evidence that they hunted on the surrounding button grass plains.

Numerous small quarries and campgrounds are located nearby, with the closest dated site putting human occupation at 10,000 years ago.

[4][5] The first European to discover Lake St Clare on Thursday 26 October 1826, was a team of three, led by convict Jorgen Jorgensen.

Jorgensen was serving his second term as a convict, but as a former British naval officer could read maps, could set a course by compass, fix map-positions as well as write up a journal for the company.

Jorgensen at fourty six years of age, set out on 2 September 1826 with 2 companions, Mark Logan a ticket of leave man (unsupervised convict), and Andy Colvert, a Tasmanian Aboriginal.

The Viking of Van Diemen's Land - Wikipedia The next European explorer to see the lake was surveyor William Sharland in 1832, with George Frankland leading an expedition to it three years later.

[13] Following a decision by the Tasmanian Government to allow development in national parks and conservation areas an "in principle" permit was granted for the establishment of an "eco-friendly" resort at Pumphouse Point at Lake St Clair;[14][15] completed in 2015.