The first salt marsh farming on the peninsula can be traced back to the Iron Age. However, it was a little later that the monks of Landévennec Abbey, when studying the tides, wind and sun, revealed the salt marshes' true face and features. Salt farming helped uphold Guérande's prosperity and reputation for many centuries.
In the 80s, if a handful of workers had not stood their ground, the Guérande salt marshes would surely have disappeared, in favour of tourism enhancement projects. Deeply attached to their land and trade, several salt marsh workers decided to join together and show solidarity. They created a group holding in 1972 and founded a cooperative in 1988, with a dual objective: sustainable salt farming and the promotion of local salt.