As Illas, White sand beach in A Devesa, Spain

As Illas is a white sand beach in A Devesa, Ribadeo, about 750 metres long and 9 to 10 metres wide, open to Atlantic waves. At high tide, depending on the year's currents, it can disappear and only three large rocks remain visible above the water, which give the beach its name. At low tide it connects with Os Castros beach.

As Illas lies in the Zona das Catedrais, a protected Natura 2000 area shared with the beaches of San Miguel de Reinante, As Catedrais, Esteiro, Os Castros, Areosa and Olga. The beach takes its name from the rocks that stay visible when the tide covers the sand. The Castros-As Illas beach received the Blue Flag in 2015.

The name comes from the three large rocks that remain visible above the water at high tide, when the sand disappears. The beach lies in the Devesa parish, by the hamlet of A Rochela, and forms part of the Zona das Catedrais, a Natura 2000 protected area shared with Os Castros, As Catedrais, Esteiro, Areosa and Olga. In 2015 the Castros-As Illas pair received the blue flag.

Check the tide tables before setting out: at high tide the sand narrows and can vanish, leaving only the three rocks that give the beach its name. Access is from Ribadeo on the N-634 towards Lugo, then a signposted right-hand turn-off that leads directly to the beach. Most services, including car parks, restaurants, hotels and a Red Cross post, lie about 500 m away; the beach itself has showers, walkways and daily cleaning.

At high tide, depending on the year's sea currents, the sand can vanish entirely, leaving only the three large rocks that rise from the water like islands and give the beach its name. At low tide it joins Os Castros beach, and both lie within the protected Zona das Catedrais, part of the Natura 2000 network.