Moulin à marée du hénan, Tide mill in Brittany, France

The Moulin à marée du Hénan is a tide mill built at the mouth of the Aven estuary near Névez, in the southern part of Finistère. The rectangular granite building sits on a straight dike reinforced with two rows of large flat stones laid directly on the mud to prevent sinking.

The mill appears in a written document from 1465 already listed as rented out, which suggests it was built before that date, likely in the early 15th century. During the French Revolution its ownership passed through several hands when it was sold off as national property, and later families maintained it until the commune of Névez took over its upkeep in the 1970s.

The mill is also known as Moulin Mer, a name that sets it apart from the river mills that were more common inland across Brittany. Visitors today can watch the sea gradually surround the stone walls and the dike at high tide, giving a clear sense of how closely the builders tied this structure to the coast.

The site sits in an isolated spot outside the center of Névez, so a car or bicycle is the easiest way to get there. Arriving around high tide gives the clearest view of the water rising along the dike and surrounding the stone walls, while low tide reveals the full structure of the foundation stones.

The house next to the mill has a window set at an angle in the wall so that someone inside could look directly toward the mill and the estuary at the same time. This small detail suggests that whoever lived there needed to keep an eye on the water level without stepping outside.