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Which body of water separates Tasmania from the state of Victoria?

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The body of water that separates the state of Tasmania from the state of Victoria is the Bass Strait.

This relatively shallow channel, which reaches a maximum width of 150 miles (240 km), serves as the primary maritime separation between the Australian mainland and the island state. It was named in 1798 by the navigator Matthew Flinders in honor of the surgeon-explorer George Bass.12