# Introduction

| Figure 1 : Three-dimensional view of the bathymetry of the Fly River estuary, Papua New Guinea. This muddy estuary is about 60 km long and a few meters deep.
| Figure 2 : Three-dimensional view of the bathymetry of the central region of the Great Barrier Reef, Australia. The shelf width is about 100 km and the depth is about 100 m at the shelf break.
| Figure 3 : Photograph of a mangrove-fringed tidal creek.

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