Figure 30. Detailed planar view of multibeam bathymetry from survey H11252 showing that sand-wave and megaripple amplitude decreases markedly westward of Six Mile Reef. Trough-to-crest sand-wave amplitude exceeds 4.7 m in eastern part of the image, but sand waves are absent and megaripple amplitudes average only about 0.25 m along western edge. Location of detailed view is shown in figure 16.