20260810 16590500 1.0 TRUE TOPO2_5M_Marine_Hazard_Polys All features have been derived or generalised from the 2.5 Million data capture. Reef - An area of rock or coral that is exposed between mean high water and lowest tide, or just below approximate lowest tide, which is visually prominent or a hazard to shipping. Activated in a scale range between approximately 1:1 million and 1:4 million. © Commonwealth of Australia (Geoscience Australia) 2016. Creative Commons Attribution 4.0 International Licence.