Piansano is a comune in the Province of Viterbo in the Italian region of Latium, located about 90 kilometres northwest of Rome and about 2…Piansano is a comune in the Province of Viterbo in the Italian region of Latium, located about 90 kilometres northwest of Rome and about 25 kilometres northwest of Viterbo. As of 31 December 2004, it had a population of 2,232 and an area of 26.5 square kilometres.
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