To enjoy the beach and your walks on the coast in total safety, use the site www.maree.info to plan your escapades according to the tide times (enter Calais, Boulogne-sur-Mer or Wissant).
The tidal range coefficients
The force of the tide is represented by a coefficient from 20 to 120. When the tides have high coefficients, the low tide goes further out than usual, revealing wide, flat, rocky areas perfect for gathering shellfish and fish.
High tides are always an amazing spectacle but do not forget the danger they represent: the tide rises very quickly, do not stay on the beach too long. A high tide with a high coefficient combined with gusts of wind can generate very powerful waves, capable of sweeping you away. Be careful.