El Franco is a municipality in the Autonomous Community of the Principality of Asturias. It is bordered on the north by the Cantabrian Sea, and to the west by Tapia de Casariego, to the south by Castropol and Boal, and to the east by Coaña. El Franco is part of the Comarca Eo Navia.The Porcia and Mazo Rivers pass through the municipality.