ducks in the shiori-no-ike pond of hama-rikyū gardens in front of a lock which adjusting the flow of water.

architecture asia birds cultural culture daimyo designated device ducks engineering flow forest garden hamamatsucha hamarikyalaquo historic hydrologic hydrology japan japanese kyushibarikyu lake level lock lowering mechanical minato national natural nature nippon onshi outdoor park plants pond property raising rusted scenic sea seawater shiodome shiorinoike sightseeing site special spot teien tidal tide tokyo tourism trees tsukijishija water