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In page Amiens:

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The city developed in a natural narrowing of the river due to the advance of the rim of the Picard plateau in Saint-Pierre (ford crossing).[citation needed] The Amiens citadel is built on this limestone butte of the Picard plateau and Rue Saint-Pierre is a slightly inclined path to leave the city from the north. At this narrowing, a network of narrow canals led to the construction of bridges and buildings including textile mills in the Middle Ages.