Historically, the economy of Saint Omer had also developed in the wetlands outside the city, known locally as "le marais", which remans one of the last cultivated "marais" in France. The Marais Audomarois is currently listed as a UNESCO heritage site The agricultural output from this area continues year-round, thanks to the mild climate and fertile soil. Among the specialties, cauliflower is a notable product and is exported throughout Europe. Other crops for which the area is know are carrots, endive, and watercress