Lake St Clair (Cradle Mountain - Lake St Clair National Park)

Lake St Clair, also known as leeawulenna, is a picturesque natural freshwater lake located in the Central Highlands area of Tasmania, Australia. It is situated at the southern end of Cradle Mountain-Lake St Clair National Park amidst stunning surroundings. It has an area of around 45 square kilometres (17 sq mi) and is Australia's deepest lake, measuring 215m (705ft) at its deepest point.

Visitors can marvel at glacial erosion, which formed the lake, along with the surrounding river valleys. The lake is fed by Narcissus River, Cuvier River, and Hamilton Creek, and marks the start of the River Derwent's journey.

Lake St Clair is located at the edge of the Big River Tasmanian Aboriginal nation, providing evidence that they hunted on the surrounding button grass plains. The area surrounding the lake was also used by snarers and hunters from 1860 until the collapse of the fur trade in the 1950s. In 1937 the Derwent River was dammed just below the lake, with a pumping station installed, enabling Hydro Tasmania to drain the lake up to 6 metres and feed water to the Tarraleah Power Station. The Cradle Mountain-Lake St Clair area was declared a scenic reserve in 1922, a wildlife reserve in 1927, a national park in 1947, and a world heritage site from 1982. The history of Lake St Clair can be enjoyed through walks, hikes, and guided tours offered in the area.

The locality of Lake St Clair has a total area of around 839.4 square kilometres (324.1 sq mi), with the lake occupying about 45 square kilometres (17 sq mi) in