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Aqueducts are structures designed to transport water over long distances, typically using gravity to maintain a steady flow. These systems have been used since ancient times to supply cities with water for drinking, irrigation, and other purposes. Aqueducts often consist of a series of arches or channels supported by pillars or walls, allowing water to flow from a source such as a river or reservoir to a destination. The design and construction of aqueducts vary depending on the terrain and the volume of water being transported.