This island is bordered to the east by the ► Tyrrhenian Sea, and the Strait of Bonifacio separates it from Corsica.  
Prehistoric civilizations on this island erected large stone slabs called giant's graves, which contain burial chambers.  Also prehistoric and on this island are a bunch of tower-like forts called (*) nuraghi.  The language of Algherese, a variant of Catalan, is spoken only in the northwestern portion of this island.  The Tirso River is the longest on this island, and its only natural freshwater lake is Lago di Baratz.  This island's capital is Cagliari.  This island is bordered to the east by the ► Tyrrhenian Sea, and the Strait of Bonifacio separates it from Corsica.  For 10 points, name this large Mediterranean island owned by Italy that was ruled by Victor Emmanuel II along with the Piedmont before Italian unification.
Prehistoric civilizations on this island erected large stone slabs called giant's graves, which contain burial chambers.  
Sardinia