Kyushu

Kyushu is Japan's southwesternmost main island, and its northern coast on Hakata Bay faces the Genkai Sea between the Iki Island chain to the northwest and the Shime coast to the east. The Genkai Sea is part of the broader Korea Strait and Tsushima Strait system connecting the Sea of Japan to the East China Sea, and the tidal character here reflects that complexity: mixed semidiurnal, with two unequal highs and two unequal lows daily and a diurnal inequality that varies noticeably through the lunar month. Mean range in Hakata Bay runs roughly 2.0 to 2.5 m, the highest of the four Japanese locations covered here, driven partly by bay geometry — Hakata Bay is a shallow, enclosed embayment with a relatively narrow entrance between the Shikanoshima tombolo to the north and the Fukuoka coastal lowland to the south, and enclosed geometry tends to amplify the tidal signal. The Uminonakamichi seaside park runs along the northern spit of the bay, accessible by train from Fukuoka station; the park's beaches and cycling paths are bracketed by the bay on the south and the Genkai Sea on the north, offering a clear view of tidal state on both coasts. Canal City Hakata, inland in the city centre, takes its name from the Naka River canal system that historically connected the city to the bay; kayakers now use sections of the Muromi and Naka rivers on flood and ebb windows. The Shingu coast, east of Fukuoka near the town of Fukutsu, has a growing sea kayak community working the pocket beaches along the rocky shoreline facing the Genkai Sea. The Japan Meteorological Agency and Japan Coast Guard maintain the official Hakata tide record; storm surge is a meaningful hazard on this low-lying coast during typhoon approach from the East China Sea. Open-Meteo Marine drives the gridded predictions on TideTurtle pages for this region.