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a) Location of the study region in the eastern Joseph Bonaparte Gulf, northern Australian marine margin overlaid with bathymetry; b) location of the four study areas (A, B, C, and D) in the study region and seabed hardness types (hard, hard-soft, soft-hard and soft) based on hard90 overlaid with bathymetry at video transect; and c) the geomorphic features of the four study areas.
