San Juan de Aznalfarache is a city located in the province of Seville, Spain. According to the 2006 census, the city has a population of 20,121 inhabitants. Despite being a separate municipality, San Juan is in the metropolitan area of Seville, to which it lies on an opposite bank of the Guadalquivir river. The city is linked by two road bridges and a pedestrian one to the Sevillian district of Triana on the Isla de La Cartuja.