East of the railway from Chilivani to Oristano, on the other hand, the granitic mountains continue.
South of Oristano and west of the districts last described, and traversed by the railway from Oristano to Cagliari, is the Campidano (often divided in ordinary nomenclature into the Campidano of Oristano and the Campidano of Cagliari), a low plain, the watershed of which, near S.
Than the Gulf of Orosei on the east coast, is the Gulf of Oristano, exposed to the west winds, into which, besides the Tirso, several streams fall, forming considerable lagoons.
The Campidano and other fertile spots, such as the so-called Ogliastra on the east side of the island, inland of Tortoli, the neighbourhood of Oliena, Bosa, &c., produce a considerable quantity of wine, the sweet, strong, white variety called Vernaccia, produced near Oristano, being especially noteworthy.
The archiepiscopal sees of the island are: Cagliari (under which are the suffragan sees of Galtelli-Nuoro, Iglesias and Ogliastra), Oristano (with the suffragan see of Ales and Terralba) and Sassari (under which are the suffragan sees of Alghero, Ampurias and Tempio, Bisarchio and Bosa).