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    The Seamap Australia spatial data layer is a nationally synthesised data product of seafloor marine habitat data. Australian continental shelf benthic habitat layers in GIS format were collected from various stakeholders around the country. Through compiling all of these data sets, we established a controlled vocabulary, reviewed by ANDS and external independent assessors, to produce a national classification of marine habitats. This national marine habitat classification scheme complements work undertaken by the National Environmental Science Program (NESP) Marine Biodiversity Hub (Theme D). Seamap Australia data can be visualised, analysed and downloaded from the Seamap Australia website. The Seamap Australia website demonstrates how this data can be complemented with existing data from BRUVS (Baited Remote Underwater Video Units), AUVs (Autonomous Underwater Vehicles), Reef Life Survey and other spatial marine data sets. The Seamap Australia data layer, and all component datasets collected from stakeholders for the purposes of this project, is additionally available for download from other external data portals, namely Research Data Australia, and the AODN and IMAS Data Portals. The Seamap Australia product is of national importance and highlights the diversity of benthic habitats around our marine estate. This is the first edition of a seafloor marine habitat data layer that seamlessly brings together data from each of Australia’s state and territory marine habitat databases. We encourage users to consider this dataset Version 1 in a larger attempt to continuously improve our skills in standardising, collating and sharing marine spatial data. We envisage that this product will be constantly developed and updated as future surveys continue to improve our knowledge of our vast marine estate.