Suimon

Suimon is a river-mouth beach-break in Miyazaki’s coastal area, focused around the water gate/sluice gate zone. The wave is described as powerful and fast, with both left and right sections, and the overall quality depends heavily on whether the sandbars are correctly aligned. The spot tends to start working at under 1 m swell and can hold into larger sizes (up to around 2 m+ in some conditions). When conditions match the sandbar, surfers report good peeling, groomed lines—however, if the swell is too energetic for the sand alignment, the wave can quickly turn into a heavy closeout. Wind-wise, sources consistently point to West wind as the best option, with offshore West winds helping groom the waves. Light morning offshore winds are described as common, so early sessions are often emphasized. North winds can make conditions choppy. For timing, the best conditions are linked to typhoon season (roughly July to October), and one dataset also highlights September through November as especially reliable. After heavy rain, the river flow and sandbar positions can change dramatically, and strong currents are a key concern—so check conditions before committing. Rescue is not reported by the spot-level data, and there are multiple hazards around the river mouth (including reefs, tetrapods, river debris, shifting sandbanks, and sluice gate structures), so extra caution is warranted.