France, Pas-de-Calais, Côte d'Opale, Marathon d'attelages sur la plage de Berck-sur-mer, this equestrian show brings together teams of one, two, three or even four horses (or even ponies!), for an endurance race over an 8 kilometers loop during which the horses pass obstacles made of mounds and other puddles in the sand. Draught horses like the Boulonnais are honoured