UMIMORI / OUR BLUE CLASSROOM
Know more. Prepare together.
A calm-looking sea can still have currents. Conditions change, so preparation continues after you arrive.
Your day by the sea
Compare waves and currents
One simplified flow pattern. Real conditions change.
START HERE
There is more to the sea than you can see.
Waves, currents, wind and terrain all matter. Start with an officially managed swimming beach, and check its designated area and local instructions.
Understand rip currentsThree moments to check.
01
Before leaving
Check beach opening information, weather, warnings, equipment and everyone’s health.
02
On arrival
Check swimming areas, flags, signs, lifeguard instructions and evacuation routes.
03
During your visit
Stay close to children. Notice changes in the sea and how people are feeling. Be ready to stop.
Check official information.
Japan Coast Guard
Swimming guidance (Japanese) ↗JMA
Weather & warnings (Japanese) ↗Japan Lifesaving Association
Water safety (Japanese) ↗
Swimming guidance (Japanese) ↗JMA
Weather & warnings (Japanese) ↗Japan Lifesaving Association
Water safety (Japanese) ↗
Sources checked: 2026-09-20. This site does not assess local swimming conditions. Safety material is awaiting specialist review.