L'Aquila is the largest province in the Abruzzo region with almost half of the area of the region; it has area of . The province is bordered to the north with Tuscany, to the northeast by the province of Teramo, to the east by the Pescara and Province of Chieti provinces, to the south and southeast with the Molise region (province of Isernia), and to the west and southwest by the Lazio region (province of Frosinone, Rome and province of Rieti).