Kaifu Rivermouth 55.7
#3588 of 5756 surf spots in the world · 🇯🇵 Japan · Tokushima · near Tokushima
Works almost every day, wind is the enemy here, no off season.
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Best time to surf Kaifu Rivermouth
The best time to surf Kaifu Rivermouth is April, September, October. It rarely works. In October the water sits around 27°C, so pack boardshorts, and the typical wave is 1.4 m. The nearest airport is KIX (124 km) and the nearest town is Tokushima (55 km).
| Month | Surfable | Clean | Size | Water | Suit |
|---|---|---|---|---|---|
| Jan | 86% | 1% | 0.9 m | 19°C | 2mm |
| Feb | 89% | 1% | 1.0 m | 18°C | 3/2 |
| Mar | 97% | 1% | 1.2 m | 19°C | 3/2 |
| Apr | 95% | 4% | 1.2 m | 20°C | 2mm |
| May | 94% | 1% | 1.1 m | 22°C | 2mm |
| Jun | 96% | 1% | 1.1 m | 24°C | vest |
| Jul | 97% | 3% | 1.1 m | 28°C | boardies |
| Aug | 80% | 4% | 1.0 m | 29°C | boardies |
| Sep | 91% | 5% | 1.3 m | 28°C | boardies |
| Oct | 97% | 9% | 1.4 m | 27°C | boardies |
| Nov | 95% | 4% | 1.1 m | 24°C | vest |
| Dec | 86% | 3% | 0.9 m | 21°C | 2mm |
What is under Kaifu Rivermouth
Eight kilometres out along its swell window the sea floor is still shallow, 20 m.
Measured, not estimated: NOAA ETOPO 2022 global relief at 15 arc-seconds, about 460 m per cell, sampled along this spot’s own swell window. At that scale the survey sees passes and channels; it cannot see a reef ledge, so nothing here is said about how the wave breaks.
Why 55.7
Seven parts, each normalised 0 to 1 and multiplied by its weight; the sum is scaled so the best spot in the world scores 100. Wave quality and what the spot does on its best days carry more than half of it, which is what separates this from a ranking of where the water is warm.
The detail
Faces 135° with 47% open water around it. Friendly morning wind 64% of days. Mean peak period 7.9 s. Days over 3 m: 2%. On its best tenth of days it reaches 2.0 m, with a peak period of 10 s. Mellow days (0.4 to 1.2 m): 57%. Months that work: 12 of 12. Coordinates 33.595, 134.364 (OpenStreetMap).
What it costs to be here
Remote spot, so the local estimate is 15% below the country average. Estimate: World Bank PPP price level for Japan (2025, United States = 1.00) applied to a fixed surfer basket, then adjusted for how remote the spot is. Your own number moves with the season and how you live.
Sumba has eight spots in this ranking, the best of them inside the world top 50. A cabin is €11,500. The land it sits on is separate, from €6,500 (€9,950 oceanfront), on an 80-year lease that extends at the end. Water, septic and electricity are another €6,500, and furniture is on top, so a finished cabin lands around €28,000 plus the land, payable in instalments.
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