Playa de Castello, Protected beach in El Franco, Spain.

Playa de Castello is a 400-metre-long beach in the parish of Miudes, El Franco, shaped like a shell or small cove and about 30 metres wide on average. Its dark, medium-grained sand is mixed with quartzite gravel, and the Castello stream flows out at the beach. The rural setting has little building, and the beach is the largest in the municipality.

The sources record no founding event or industrial episode for the beach itself; what they document is its environmental status. Although it lies outside the Paisaje Protegido de la Costa Occidental de Asturias, Playa de Castello is catalogued both as a ZEPA (Special Protection Area for birds) and a LIC (Site of Community Importance). Nearby stands the castro de El Castellón, an Iron Age hillfort settlement of the kind found across this Asturian coast.

The beach takes its name from the Castello stream that flows into the sea here. Nearby stands the Castro de El Castellón, an Iron Age hillfort site, and a recently created recreational area sits close to the sand. The coastal path GR E-9 passes along this stretch from Ortiguera to Viavelez.

Vehicle access is difficult: cars can get to within about a kilometre of the sand, and the nearest villages are Arboces and Castello. Signs on the N-634 road point the way. The GR E-9 coastal path from Ortiguera to Viavelez passes the beach, and a campsite and recreation area lie nearby.

The beach is the most easterly in El Franco, almost touching the beaches of Coaña. Its dark, medium-grained sand is mixed with quartzite gravel, and the nearby Castro de El Castellón and a recently created recreation area sit close by.