The Ría de Arousa is a ria, a saline estuary, that forms a firth situated on Galicia, Spain. It is one of the five Rías Baixas. The Ría de Arousa estuary is the largest of the estuaries of Galicia. It is part of the Rias Baixas and is located between the estuary of Muros and Noia to the north and the Pontevedra estuary to the south.