The Santa Olaja mill is located in the Joyel Marshes in Soano, in the municipality of Arnuero in the autonomous community of Cantabria, Spain. It was declared a Bien de Interés Cultural in November 2013.
The Santa Olaja mill is a tide mill. It is one of the main attractions within the Trasmiera Ecopark, a park which was voted an EDEN destination winner in 2011. The mill was constructed in the fourteenth century and remained operational until 1953. It had ten 10 wheels which gives an idea of its importance. This building is a very distinctive example of sea or tidal mills, hydraulic devices prototypical of the Renaissance technological culture in Cantabria. Its operation consists of storing water during high tide in a natural reservoir enclosed by dams, which is later used to activate the other mechanisms.
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