Forte de São João da Barra
Conceição e Cabanas de Tavira, Portugal
The Fort São João da Barra (Fortaleza de São João da Barra in Portuguese) also known as Fort São João Baptista (Fortaleza de São João Baptista in Portuguese) or Fort Conceição (Forte da Conceição in Portuguese), is located to the east of the town of Cabanas de Tavira, on a small hill below the Ria Formosa in the municipality of Tavira, in Algarve, southern Portugal.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).