Estarreja (Portuguese pronunciation: [(ɨ)ʃtɐˈʁɐjʒɐ] (listen) or [(ɨ)ʃtɐˈʁɛʒɐ]) is a municipality in Portugal. The population in 2011 was 26,997, in an area of 108.17 km². It had 22,746 eligible voters in 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.