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annually. Some of the étangs are the remnants of old arms and legs of the river. The general trend is for the coastline to move outwards as new earth is deposited in the delta at the river's mouth. Aigues-Mortes, originally built as a port on the coast, is now some 5 km inland. The pace of change has been modified in recent years by man-made barriers, such as dams on the Rhône and sea dykes, but flooding remains a problem across the region.