The old A Seca tide mill, currently restored and converted into a museum, is located in the Arousa Estuary in Pontevedra, between the Tragove and Fefiñáns points. On this cove a dam of approximately 50 metres was installed. It is called A Seca because the inland area dries out in low tide and fills with water again at high tide. The ebb and flow is utilised to make its four millstones operate.