The beautiful Callejón del Agua in the Barrio de Santa Cruz runs alongside a stretch of wall about 140 meters long. It is original from the 12th century, built using mud walls and today it appears much lower than it originally was due to the elevation in ground level.
Three rectangular towers have been preserved in this section. Next to the one closest to the Plaza de Alfaro, you can see the ends of the two large clay pipes that run along the wall in this section. Originally they were conceived to conduct water from the Puerta de Carmona to the gardens of the Alcázar. The water came to this door from some sources in Alcalá de Guadaira through an aqueduct known as the Caños de Carmona, of which some scattered fragments have been preserved on Luis Montoto street and on Avenida de Andalucía.