Cascata delle marmore
You'll run in Valnerina, start in Terni, San Valentine's church and arrive in Marmore Falls after 6 km, Arrone, Montefranco, Ferentillo and return.
The creation of the Falls dates back to271 AD and is an incredible work of Roman engineering, designed to favour the out flow of the Velino waters, responsible for frequent and disastrous flooding and transformation of extensive areas of land into unhealthy swamps.
The main cavities of speleogical interest as well as for the beauty and evocative power of the environment, are enclosed in three distinct complexes: the first includes the Grotta della Morta (Cave of Death)and the Grotta delle Diaclasi, and spreads over 287 m. with a maximum depth of 23 m.; the second is the Grotta delle Colonne (Cave of Columns), developed in two main parts, that afterwards collapsed forming two non communicating environments; finally with a spread of over 190 m., theGrotta della Condotta, partly collapsed with an old water pipe passing through it.
The vegetation along the entire course of water is luxuriant and flourishing.
The area of the Falls features great examples of willows, alders and holm oaks. The Aleppo pine often clings to the calcareous emergences of the slopes while the hill sides are covered with holm oaks, oaks, maples and beeches.
The Botanic Garden inside the Regional Nera River Park (2460 hectares) is well worth a visit where different plant life of the area can be admired.