Best beaches in Sanmu

2 ranked beaches in Sanmu, Chiba Prefecture

Ranked by the OnlyBeaches Index (OBI) — a 1-10 score blending water purity, conditions, crowd levels and vibe. Updated every 30 minutes.

All beaches in Sanmu

1
Hasunuma Beach
Well-known for surf spots and seaside park nearby

7.0

2

Honsuka Beach

Underrated stretch known for tranquil sunsets

7.0

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.