The Tamagawa Aqueduct is a historic waterway located in Japan, built in the early 17th century. It was constructed to supply fresh water from the Tamagawa River to the growing population of Edo, now known as Tokyo. The aqueduct spans approximately 43 kilometers and features a series of canals and tunnels. This engineering marvel played a crucial role in the development of the city, supporting agriculture and daily life. The Tamagawa Aqueduct is recognized for its significance in Japanese history and remains an important cultural heritage site, showcasing the ingenuity of traditional Japanese water management.