Hanamizu River (Ninomiya)

Hanamizu River is a well-known, exposed river-mouth surfing break on the Shonan Coast, where shifting sandbars can produce punchy peaks. The break is reported as having fairly consistent surf, and it commonly works best when a southeast swell arrives with offshore northwest wind. Wave direction is described as supporting both sides (lefts and rights), with northwest winds helping groom the faces. When winds turn onshore from the south, chop can increase and wave quality tends to deteriorate. The spot is also noted as being able to handle larger typhoon swells, though it can become very heavy due to strong currents near the river discharge. Safety is a key consideration: the river mouth can generate strong currents, and there may be debris after rain or storms. Water quality can drop after heavy rainfall, so it’s advised to avoid surfing immediately after such events. The area can also get quite busy when surf is up, and tetrapods and river-mouth hazards are reported near the launch/shore zones. For timing, October is highlighted as the best month, while autumn is the broader best season. Reported conditions suggest suit needs vary by month, with full suits in colder periods and lighter protection during warmer summer peaks.