Riberas del Guadaíra Nature · Alcalá de Guadaíra, Comarca Metropolitana de Sevilla, Seville Image of Alcalá de Guadaíra, not of the place itself. Stretch of the Guadaíra river as it passes through Alcalá, with the remains of its historic flour mills, declared a Monumento Natural in December 2011. Photo: Zarateman (CC0) What to see and do in Alcalá de Guadaíra