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During the Merovingian period, the terrain presently occupied by Cucq, Le Touquet, Merlimont and Berck was either marshland or tidal.

Little by little, the sea withdrew and the marshes were covered by sand and the dunes. The grass-covered dunes of Cucq and Trépied are the result of centuries of coastal movement. The sand of the lower beach, blown by the wind at low tide, accumulated to form a cordon of dunes along the coast.

Origins of the names of Cucq and Trépied[edit]

Cucq or Cuc in Celtic meant "height, hill" or in Latin "fortified". The town was originally situated on a dune slightly higher than others in the vicinity, from which the comparison and the name of Cucq or Cuck or Cucques has evolved.

Trépied is so-called because of the triangular outline of the town.