man-made conduit for carrying water. In a restricted sense, aqueducts are structures used to conduct a water stream across a hollow or valley. In modern engineering, however, aqueduct refers to a system of pipes, ditches, canals, tunnels, and supporting structures used to convey water from its source to its main distribution point.
Romans were not the first ones to build aqueducts
Qanāt systems were in use in ancient Persia, India, Egypt, and other Middle Eastern countries hundreds of years earlier to bring water for irrigation to the plains below
Approximately two million large blocks were used to make a water channel 10 metres (30 feet) high and 275 metres (900 feet) long across a valley
Roman aqueducts were built throughout the empire, and their arches may still be seen in Greece, Italy, France, Spain, North Africa, and Asia Minor