Beach of Río Sieira Nature · Porto do Son, Noia, A Coruña Beach almost a kilometre long and about 28 metres wide, located in the parish of Xuño, at the place called A Coviña, into whose sand the Sieira river flows, from which it also takes its alternative name Boca do Río. It is an isolated stretch of sand, without a seafront promenade, made up mainly of rocks and fine white and golden sand; the river's mouth forms a lagoon system that also allows bathing in fresh water, calmer than that of the sea. Its line of dunes is included in the Natura 2000 Network and remains undeveloped; summer occupancy is average. Photo: Luis Miguel Bugallo Sánchez (Lmbuga) (CC BY-SA 3.0) What to see and do in Porto do Son