Lazio

Lazio comprises a land area of 17,236 km² (6,655 sq mi) and it has borders with Tuscany, Umbria, and Marche to the north, Abruzzo and Molise to the east, Campania to the south, and the Tyrrhenian Sea to the west. The region is mainly flat and hilly, with small mountainous areas in the most eastern and southern districts.

The coast of Lazio is mainly composed of sandy beaches, punctuated by the headlands of Circeo (541 m) and Gaeta (171 m). The Pontine Islands, which are part of Lazio, lie opposite the southern coast. Behind the coastal strip, to the north, lies the Maremma Laziale (the continuation of Tuscan Maremma), a costal plain interrupted at Civitavecchia by the Tolfa Mountains (616 m). The central section of the region is occupied by the Roman Campagna, a vast alluvial plain surrounding the city of Rome, with an area of approximately 2,100 km² (811 sq mi). The southern districts are characterized by the flatlands of Agro Pontino, a once swampy and malarial area, that was reclaimed over the centuries.