Researchers from Australia's national science agency have measured Tasmania's Lake St Clair with high-resolution detail, creating a 3D-map modelled from sonar pulses.

Past estimates of the lake's depth, provided in the 1860s and 1965, had put it at between 160 to 215 metres.

But the recent CSIRO research definitively places Lake St Clair at 163 metres deep, nearly twice the depth of Bass Strait.

CSIRO hydrographic surveyor Augustin Déplante said the finding has put much speculation about the lake's size to rest.

"Our mapping confirms that Lake St Clair is absolutely Australia's deepest lake, with the next deepest lake being less than 100 metres deep,"

he said.

Mr Déplante said he "felt quite compelled" to map it himself after discovering that Australia's deepest lake had never been m

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