Sant'Ermo is a village in Tuscany, central Italy. It is administratively a frazione of the comune of Casciana Terme Lari, province of Pisa. At the time of the 2001, census its population was 114. Popolazione residente - Pisa (dettaglio loc. abitate) - Censimento 2001 , Istat.
Sant'Ermo is about 40 km from Pisa and 7 km from Lari.
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