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The Apennines of Latium are a continuation of the Apennines of Abruzzo: the Reatini Mountains with Terminillo (2,213 m), Mounts Sabini, Prenestini, Simbruini and Ernici which continue east of the Liri into the Mainarde Mountains.

To the south of the Tiber, other mountain groups form part of the Preapennines: the Alban Hills, also of volcanic origin, and the calcareous Lepini, Ausoni and Aurunci Mountains. The Preapennines of Latium, marked by the Tiber valley and the Liri with the Sacco tributary, include on the right of the Tiber, three groups of mountains of volcanic origin: the Volsini, Cimini and Sabatini, whose largest former craters are occupied by the Bolsena, Vico and Bracciano lakes. The southern districts are characterized by the flatlands of Agro Pontino, a once swampy and malarial area, that was reclaimed over the centuries. 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 km 2 (811 sq mi). Behind the coastal strip, to the north, lies the Maremma Laziale (the continuation of the Tuscan Maremma), a coastal plain interrupted at Civitavecchia by the Tolfa Mountains (616 m). The Pontine Islands, which are part of Lazio, are off Lazio's southern coast. The coast of Lazio is mainly composed of sandy beaches, punctuated by the headlands of Cape Circeo (541 m) and Gaeta (171 m).

The region is mainly flat, with small mountainous areas in the most eastern and southern districts. Lazio comprises a land area of 17,242 km 2 (6,657 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 capital of Lazio is Rome, which is also the capital and largest city of Italy. Situated in the central peninsular section of the country, it has 5,714,882 inhabitants – making it the second-most populated region of Italy (after Lombardy) – and its GDP of more than €197 billion per year means that it has the nation's second largest regional economy. Lazio ( UK: / ˈ l æ t s i oʊ/ LAT-see-oh, US: / ˈ l ɑː t-/ LAHT-, Italian: ) or Latium ( / ˈ l eɪ ʃ i ə m/ LAY-shee-əm, US also /- ʃ ə m/ -⁠shəm from the original Latin name, pronounced ) is one of the 20 administrative regions of Italy.