Castro Marim

Built around a medieval hilltop fortification, Castro Marim grew into a border town above the Guadiana estuary. Below its walls, the Reserva Natural do Sapal de Castro Marim e Vila Real de Santo António protects salt marshes, tidal channels and traditional salt pans along Portugal’s frontier with Spain. Salt is still harvested here, continuing a local practice shaped by the estuary. Castro Marim Castle was an early headquarters of the Order of Christ, while the nearby 17th-century Fort São Sebastião recalls the town’s strategic role. View additional webcams nearby to better understand how Castro Marim and the eastern Algarve relate to the Guadiana estuary and Spanish border.

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