Landscapes & nature
Lake Martignano
Crater lake
Wikipedia names Lake Martignano as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Lake Martignano. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Anguillara Sabazia
Italy · 4 km south-west
Italian comune
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Landscapes & nature
Lake Bracciano
Italy · 7 km west
A lake of volcanic origin in the Italian region of Lazio, 32 km northwest of Rome. It is the second largest lake in the region and one of the major lakes of Italy.
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Towns & cities
Formello
Italy · 8 km south-east
Italian comune
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Towns & cities
Olgiata
Italy · 9 km south
Human settlement in Italy
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Towns & cities Monterosi
Italy · 9 km north
Italian comune
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Landscapes & nature
Cascate di Monte Gelato
Italy · 10 km north-east