The Aqua Anio Vetus was an ancient Roman aqueduct that supplied water to the city of Rome. Completed in 272 BC, it was one of the earliest aqueducts built by the Romans. The aqueduct sourced its water from the Anio River, located about 91 kilometers away, and was notable for its long distance and engineering techniques. This aqueduct primarily served the needs of the growing population of Rome and contributed to the city's public baths, fountains, and private households. The Aqua Anio Vetus was an essential part of the Roman water supply system, showcasing the advanced engineering skills of the Romans.