An 18,000-year-old phalanx was uncovered at this region’s archaeological site of Corbeddu cave. This region’s Arzachena and Ozieri cultures preceded a civilization that built megalithic graves called “giant's tombs.” Structures called Domus de Janas were built in this region prior to a civilization that constructed giant stone towers including one at Santu Antine. Circular fortresses called (15[1])nuraghe (15[1])were constructed in this region, lending its name to this region’s Nuragic civilization that interacted with (15[1])the (*) Phoenicians. A 238 BC invasion of this island targeted the (-5[1])provincial capital of Caralis, which would become Cagliari. After this island was conquered by the Romans, an ancient Roman province grouped this island with nearby Corsica. For 10 points, name this Italian island, the second-largest in the Mediterranean. ■END■ (10[1])