I certainly didn't know it at the time but the salt marshes on Il de Re have been producing high quality sea salt for many centuries.
While the draining of the marshes and industrialisation marked the decline in the importance of Il de Re and other salt producing areas, the activity that still exists today through the remaining forty artisan salt farmers on the island.
We passed a number of these salt farmers on a morning bike ride out from Les Portes-de-Re. Must be hard work on a hot day.