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Department of Mineral and Petroleum Resources Department of Land Administration CALM Marine Conservation Australian Hydrographic Office. Acknowledgements:. State and Territory Borders. Approx 36,000 km around the mainlandAnother 24,000 km around islands. The longest boundary?. Australia's Coas
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1. The Longest Boundary- defining Australia’s coastline Bill Hirst & David Robertson
National Mapping Division
of Geoscience Australia