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The article discusses the function of Calais and Dunkirk regions in the navigation system in France. It states that the areas have been outside the traditional feudal system. It outlines the influence of the inland abbeys which has been maintained, particularly in religious affairs, and the coastal prairies were under the long-term authority of the area's government. It claims that the process of centralizing local and regional powers placed a special focus on the development of the maritime sector in the eleventh and twelfth centuries.