Littoral Cell

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Littoral Cell (English)
沿岸セル (日本語)
Celda litoral (Español)
Cellule littorale (Français)

A reach of the coast that is isolated sedimentologically from adjacent coastal reaches and that features its own sources and sinks. Isolation is typically caused by protruding headlands, submarine canyons, inlets and some river mouths that prevent littoral sediment from one cell to pass into the next. Cells may range in size from a multi-hundred meter Pocket Beach in a rocky coast to a Barrier Island many tens of kilometers long.

Also see here and here.