Morphologically there are two units: the first consists of a series of mountain ridges which include the Sierra de Carba in the west with the Pena da Agua (832 m), Sierra del Gistral in the northwest and the Sierra de Toxiza in the northeast with the Coto Cal (804 m). These elevations make up the northern edge of the Lugo plateau. The second unit constitutes the gently undulating, horizontal and morphological area of erosion which surfaces between 400 and 600 meters with the only elevation at Neda's Peak (796 meters) in the Cordal de Neda.