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In this picture, notice how the stream bank is eroding on the near side. Also notice the sand bank being built on the far side. This is typical of the fact that erosion of the winding stream bank on one side is compensated for it by build-up on the other side, thus maintaining over the long term a constant ratio of stream bed to marsh land. Just enough stream bed is needed for the high tide to fill this size marsh with water.
     This picture shows two naturally formed side streams joining the main stream.
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