Monte Circeo or Cape Circeo (Italian: Promontorio del Circeo [promonˈtɔːrjo del tʃirˈtʃɛːo], Latin: Mons Circeius) is a mountain promontory that marks the southwestern limit of the former Pontine Marshes, located on the southwest coast of Italy near San Felice Circeo. At the northern end of the Gulf of Gaeta, it is about 5 kilometres (3.1 mi) long by 1.5 kilometres (0.93 mi) wide at the base, running from east to west and surrounded by the sea on all sides except the north. The land to the northeast is the former ancient Pontine Marshes. Most of the ancient swamp has been reclaimed for agriculture and urban areas.

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Mount Circeo
Mount Circeo as seen from Terracina, Italy
Highest point
Elevation	541 m (1,775 ft)
Prominence	541 m (1,775 ft)
Coordinates	41°14′00″N 13°03′00″E
Geography
Mount Circeo Italy
Location	San Felice Circeo, Lazio, Italy

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The mountain, the coastal zone as far north as Latina, including the only remaining remnant of the swamp, and two of the Pontine Islands offshore, Zannone and Ponza, have been included in the Circeo National Park.

Although a headland, it was not formed by coastal erosion – as headlands are usually formed – but is a remnant of the orogenic processes that created the Apennines. The entire coast of Lazio, on which the mountain and the marsh are located, was a chain of barrier islands that was formed on a horst and made part of the mainland by sedimentation of the intervening graben.

The mountain is composed mostly of marl and sandstone from the Paleogene and of limestone from the lower Early Jurassic.

In 1939, the skull of a Neanderthal man was found in the Guattari Cave by a team led by Alberto Carlo Blanc. Several other findings also show that the mountain was inhabited in prehistorical times.^[1][2] In May 2021, the remains of 9 Neanderthal men were discovered in the same Guattari cave. The Minister of Culture in Italy declared the site to be one of the most significant in the world regarding the Neanderthal period.^[3][4]

Mount Circeo is today included in the National Park of Circeo, established in 1934 on 5,616 ha (56.16 km²; 13,880 acres; 21.68 sq mi) over the territories of Latina, Sabaudia, San Felice Circeo and Zannone Island (minor island of Ponziane Archipelago).