Aniene änyā´nā [key], Lat. Anio, river, 61 mi (98 km) long, rising in Latium, central Italy, and flowing generally southwest to empty into the Tiber River near Rome. Two aqueducts have carried water from the Aniene to Rome since ancient times, and now the river also supplies several hydroelectric plants. Below Tivoli, where it forms a celebrated waterfall, it is also called the Teverone.
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