Fiora River the historic river of Vulci can be considered an ancient natural boundary. Called “Armine” by Etruscans, quoted several times from classical sources and witness of the oldest population of Lazial Maremma, Fiora River, through the millennia, has been the boundary between northern and southern Etruria, between Tuscan and Lazial Maremma. The River flows from Mount Amiata (in Tuscany) for about 83 km; along its path, near Vulci naturalistic-archaeological Park, a dam rises a small lake called Lake of ponte della Badia or Montauto Lake, before the River flows to Tyrrhenian Sea at Marina di Montalto. Among its tributaries, the River Olpeta was important to the Etruscans and especially to those who lived the area of Rofalco, inside the Natural Reserve of Lamone.

In its initial route the Fiora River runs almost entirely on the bottom of deep canyons and calcareous tuff, carved over millennia by the force of water. The tuff in which those gorges are carved are linked to volcanism and sedimentation. North of Montalto di Castro, the Natural Reserve of Lamone extends along the border of Tuscany on a vast lava plateau composed of a base that gives rise to large rocks, called "murce" , to be connected to the cooling of lava. The Reserve is vastly covered by a dense oak forest and is characterized not only by "murce", but also by an inextricable vegetation and few paths that contribute to create an attractive area of utter impenetrability. Those places has been the environments of the raids of the famous local bandit Domenico Tiburzi lived in the second half of the 19th century. The village of Cellere has opened a truly original museum dedicated to Tiburzi, the Museum of Banditry. The Museum is a tribute to the story of brigandage in the Lazial Maremma, offered through an anthropological reading. Near the Lamone Wood, the small Mezzano Lake, originally a volcanic crater, is a place where enjoy trekking tours, while the village of Farnese, with its beautiful Museum "F. Rottatore Vonwiller" proposes archaeological remains from the Etruscan settlement of Rofalco. Originally a "fortress",  Etruscan Rofalco was built around 350 BC; territory of the ancient and powerful city of Vulci (a metropolis at the time), Rofalco was considered as a storage place for food, controlled from above Olpeta River Valley, an important natural route that also connected the lower reaches of the River Fiora with the plain of Mezzano Lake, along an important route from the Tyrrhenian coast to the Bolsena Lake area.

During its run to the sea, the Fiora River meets the area of the ancient settlement of Castro (historical remains), flows along the hermitage of Poggio Conte, one of the most beautiful hermitages of these places near Ponte San Pietro. Here the Fiora Valley is bordered by cliffs of tuff in which, during the early Middle Ages, monks fleeing from the temptations of the world dug their home, to feel closer to God and the Created, intoxicated by the quiet of nature. Thus were born several hermitages or rock monasteries, characterized by more complex architectures, including both houses of the hermits and the place of worship.

Continuing its run towards the sea in Marina di Montalto, Fiora River flows through the cliffs of the ponte della Badia near Vulci, historical record of life on the territory inhabited by the Etruscans, in the current territories of the municipality of Montalto di Castro and Canino. Inside the area of Vulci naturalistic-archaeological Park then, the River draws some loops, ideal place to experience nature activities and “archeotrekking” (archaeological trekking) before lapping Montalto di Castro and flow to the beautiful sandy beach of Marina di Montalto.

The Fiora River is the great pretender of life in Lazial Maremma and together with Vulci naturalistic-archaeological Park, landscapes and poorly urbanized areas, unique medieval villages determine the local "genius loci" that satisfy the curiosity and the desire to knowledge of the traveller.