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In the estuary of the Guadiana river valley, small Castro Marim emerges, 5 km from Vila Real de Santo António.
Historically it was an important region to protect the south coast of Portugal – once a long island that defended the Guadiana bar and dominated the entire estuary.
After the Muslim conquest of the Iberian Peninsula (VIII), the Moors dominated the region until 1242 – when the master of the Order of Santiago, Paio Peres Correia, conquered Castro Marim for Portugal.
Some of the places of mandatory stop in Castro Marim are the Castle, the Church of Santiago, the radiant Sapal Nature Reserve, the Mother Church of Nossa Senhora dos Mártires, the old Municipal Market, the Fort of São Sebastião in Cerro do Cabeço, the Revelim from Santo António, the refreshing Spa Salino da Água Mãe, the Castro Marim Golfe and Country Club, the stunning Barragem do Beliche, and the viewpoint of the Odeleite reservoir (a tributary of the Guadiana river).