Estarreja is a municipality located in Portugal. As of 2021, the municipality covers an area of 108.17 km² and has a population of 26,213. The city of Estarreja serves as the only city within the municipality and is situated in the urban parish of Beduido.
The city is built along the banks of the Antuã River, positioned near the Ria de Aveiro. It is recognized as an important center for the chemical industry, notably hosting several industrial facilities belonging to CUF. The city itself has a population of approximately 7,000 residents.