Sayama Pond, Irrigation reservoir in Ōsakasayama, Japan.
The Sayama Pond covers 40 hectares with a circumference of 3.4 kilometers and features an earthen dam that rises 18.5 meters above the Nishiyoke River.
Archaeological studies of wooden pipes discovered beneath the north bank indicate the reservoir's construction occurred in 616 CE during the reign of Empress Suiko.
The Buddhist monk Gyoki, recognized as Japan's civil engineering pioneer, directed the first renovation of Sayama Pond in 731 CE, establishing water management practices.
The reservoir supplies irrigation water through an intricate channel network while functioning as a flood control system with a capacity of 2,800,000 cubic meters.
The site contains preserved wooden pipes and stone coffins from different construction periods, displayed at the Osaka Prefectural Sayama Pond Museum.
Location: Osakasayama
Height: 18.5 m
Part of: 100 Best Reservoirs in Japan
GPS coordinates: 34.50333,135.54972
Latest update: May 27, 2025 09:52
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