Estarreja (Portuguese pronunciation: [(ɨ)ʃtɐˈʁɐjʒɐ] (listen) or [(ɨ)ʃtɐˈʁɛʒɐ]) is a municipality in Portugal with a total area of 108.4 km² and a total population of 28,236 inhabitants, and 22,746 electors (2006). The only city in the municipality is Estarreja, which is in the urban parish of Beduido. The city itself has a population of approximately 7,000. It is built along the banks of the Antuã River, near the Ria de Aveiro. Estarreja is an important chemical industry centre, being the place where several industrial faciliies of CUF are located.