The Valnerina
Facts checked: July 2026. Casteldilago is seven minutes from us, and we stop mostly for one excellent reason, named below.
Casteldilago is a fistful of stone lanes wrapped around a rock spur above the valley road – a frazione of Arrone whose name remembers a lake that isn’t there any more: the valley floor here was marsh and water until it was drained around 1580 (the story). It’s a ten-minute village. It also contains one of the valley’s best small restaurants, which changes the arithmetic entirely.
The village
Climb the spur and you’re through it in a pleasant quarter hour: tight lanes, a belvedere or two over the Nera, and the church of San Valentino – yes, Terni’s saint, out here in the valley – a church of possibly early-medieval origin with a 16th-century portal and a frescoed lunette of the Madonna and Child above the door, recently restored and returned to worship (details). The second church, San Nicola, holds frescoes of the Spoleto school. Opening is informal – ask in the village.
A little history
The spur was fortified early – a castle stood here by the 11th century, of which only fragments survive – and its position earned its keep: it watched the old route between the Via Flaminia and the Via Salaria (e-borghi). The lake that gives the place its name once filled the valley floor below; it was drained around 1580, its water carried off by the hydraulic works tied to the Marmore falls downstream. Roman-era remains have also been recorded on and around the spur (the record). Casteldilago kept its own identity for centuries before it was formally absorbed into the comune of Arrone in 1875.
The reason you’re really here
Osteria dello Sportello (Via dello Sportello 2) – a tiny osteria in the borgo doing the Valnerina’s food memory: local salumi, legume soups, spit-roast meats. It carries listings from the Accademia Italiana della Cucina and features in the local albergo diffuso’s own recommendations (profile; TripAdvisor). Small room, small menu – book ahead, and check opening days by phone, which vary out of season.
Fitting it in
Casteldilago sits between Arrone (3 minutes) and Montefranco (5), just off the valley road – which makes the natural move a lane-wander before lunch at the osteria, or the coffee stop at Bar All’Isola just below the village. On foot or by bike, the riverside route passes beneath it.
Frequently asked questions
Is Casteldilago worth a stop?
As a village: for completists – fifteen atmospheric minutes. As a lunch: absolutely – the osteria is a destination in its own right, and the village is its antipasto.