网页2018年5月21日 · Latium (lā´shēəm), Ital. Lazio, region (1990 pop. 5,170,672), 6,642 sq mi (17,203 sq km), central Italy, extending from the Apennines westward to the Tyrrhenian Sea. Rome [1] is the capital of the region, which is divided into Frosinone, Latina, Rieti, Rome, and Viterbo provs.