Pedra Longa is found in the locality of the same name, in the municipal area of Baunei. It has a rocky seashore. Its waters are of a changing blue due the plays of light created by the sun reflected on the seabed of stones. The name is linked to the presence in its waters of the Agugliastra, a sort of calcareous pyramid, up to 130 meters high above sea level, that obviously gives its name to the place: pedra longa means, in fact, 'tall stone.'