What makes Sanmu's beaches stand out?
Sanmu sits in Chiba Prefecture, Japan and is home to 2 ranked beaches on OnlyBeaches. Every beach here is scored by the OnlyBeaches Index — a 1-10 metric blending water purity, live conditions (waves, water temperature, wind), crowd intelligence and vibe.
Whether you're after the highest-scoring beach in Sanmu or a quieter hidden cove, the list above is refreshed every 30 minutes using live Stormglass and OpenWeather data.