The gates are dikes, functioning as locks, in order to control the amount of water that is in the marsh, so as not to suffer from fluctuations associated with high and low tides.
The portes du chapître in the last decades of the 18th century made the canal more reliable and easier to navigate. While the massive human interventions to drain and make …
Here the bike trail leaves the road and begins a long segment on pleasant trails through the coastal wetlands and fields, maintained by goats and sheep, so the trail passes some gates to keep the herds inside