Abruzzo or Abruzzi is a region of Southern Italy with an area of 10,763 square km and a population of 1.3 million. It is divided into four provinces: L'Aquila, Teramo, Pescara, and Chieti. Its western border lies 80 km (50 mi) east of Rome. Abruzzo borders the region of Marche to the north, Lazio to the west and north-west, Molise to the south and the Adriatic Sea to the east. Geographically, Abruzzo is divided into a mountainous area in the west, which includes the Gran Sasso d'Italia, and a coastal area in the east with beaches on the Adriatic Sea.