Twice a month high and low tides are more extreme: known as "grandes marées" or "marée de vive eau", alternating with "petites marées" or "marée de morte-eau" (when the sea does not draw back as far). Twice a year, during the Spring and Autumn equinoxes, the sea uncovers a greater area of beach which sometimes results in almost miraculous catches of fish. The tides are measured using coefficients ranging between 20 and 120 (20: "marée de morte-eau"; 70 : average tide; above 110 : "marée de vive eau").
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