It is located in the marshes of the river Lea, a few metres from its mouth. Of the old Marierrota mill, which was built in the 16th century and demolished in 1980, only the dam remains.
It was a sea water mill, similar to river mills. Its distinctive feature was: a large masonry dam, a dam that was filled at high tide and emptied at low tide, which started the mill’s machinery.
The mill has now been restored and contains an interpretation centre inside. It is open to visitors at weekends during the summer.