The Kanna Dam (漢那ダム) is a concrete gravity dam on the Kanna River in Ginoza Okinawa Prefecture Japan. The purpose of the dam is water supply and flood control. After studies were carried out in the 1970s construction on the dam began in 1982 and it was completed in 1992. The dam is 45 m (148 ft) tall and 185 m (607 ft) long. In order to retain the reservoir a 37 m (121 ft) tall and 500 m (1640 ft) long saddle dam was constructed directly northeast of the dam.
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