Beaches, lakes & rivers

Where to swim, paddle and cool off in Japan, and how clean the water is.

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BeachesThe best stretches near Tokyo and Osaka, Blue Flag or equivalent ratings, lifeguard seasons and facilities.

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LakesSwimming lakes, water quality reports and lakeside towns.

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RiversSafe swimming spots, kayaking and rafting, and rivers to avoid.

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Water qualityOfficial bathing-water monitoring, seasonal algae and jellyfish, and whether tap water is drinkable.

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SeasonFour distinct seasons; humid summers, cold winters (heavy snow on the Sea of Japan side), cherry-blossom spring and crisp autumn. Okinawa subtropical.

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HazardsCurrents, rips, marine life and flags. Severe-weather risk rating 75/100.

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Official & reference sources

Geography and climate of Japan (Wikipedia) ↗
Japan National Tourism Organization (official tourism board) ↗