Umbria: a 165 meter waterfall the Romans switched on

The most photographed waterfall in Umbria is a Roman public works project: the Marmore falls drop 165¹ meters on three leaps because engineers cut the Curiano channel in 271¹ BC, and the water still runs to a timetable.

Built in 271 BC, and still switched on and off

Roman engineers created the Marmore falls in 271¹ BC, cutting the Curiano channel to drain the stagnant water of the Velino from the Rieti plain into the river Nera. The drop they made is 165¹ meters over three leaps, and none of it is natural.

That history has a live consequence. Outside the release hours the water is diverted to a hydroelectric plant and the falls fall to a trickle, controlled by sluice gates at the top of the drop.

Anyone arriving without checking the calendar risks seeing a wet cliff. The release times change month by month and differ between weekdays and holidays, published as a seasonal calendar that has to be reread before each visit.

The ticket, and the cheap winter version

Entry to the Marmore park costs €12 full from age 10 upward, €10 reduced for ages 5 to 9 and over 70s, and nothing under 5. Groups of 15 or more pay €10 a head, an Umbria Green Card holder pays €8, and the internal shuttle costs €4.

On winter days with no water release the ticket drops to €6. That price exists precisely because the falls are switched off, and the honest reading is that the park is charging half for half the show.

Residents of the comune of Terni, people with a serious disability and licensed guides enter free, and a camper can park for 24 hours for €20.

Lake Trasimeno: the islands are not guaranteed

The Busitalia ferries to the Trasimeno islands run a seasonal service from July 5 to September 27, 2026, with crossings of 15 to 30 minutes to Isola Maggiore from Passignano and from Tuoro Navaccia.

Two routes are missing this year. The Castiglione del Lago crossing is suspended because of the water crisis, and the entire service to Isola Polvese stopped on June 29, 2026. The operator warns that remaining sailings may run at reduced capacity.

Landing on Isola Maggiore carries a fee of €3 from March 1 to October 31, 2026 and €2 the rest of the year. Single crossings cost €4.20 to €5.40, returns €6.00 to €10.00, and a full day adult ticket is €14.30³.

The park around the lake: 13,200 hectares since 1995

The Regional Park of Lake Trasimeno was established in 1995 and covers 13,200⁴ hectares across five comuni. The lake at its center is the largest in peninsular Italy.

The numbers that matter here are the vertical ones. The water surface runs 124⁵ to 128⁵ square kilometers, but the depth is only 3 to 6 meters, and the regional hydrometric zero is set at 257.33⁶ meters above sea level.

A lake that wide and that shallow loses height fast in a dry year, which is the mechanism behind the suspended crossings above. Depth, not surface, is the number to watch.

What connects the two

Each of the two sites is water under management: one is a Roman diversion still operated on a schedule, the other a lake whose level has cut the boat service in the same season.

Umbria's water landscapes are engineered or endangered, sometimes both, and that is the most useful thing to know before planning a day around them. The regional environmental agency does not publish an accessible page on the lake level, so no figure for it appears here.

More in Umbria, Lake Trasimeno and the waterfall Rome built.

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