Yamanashi, Japan
County page for 4 named lakes in Japan. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
Lake map
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| 山中湖 | Yamanashi | 10 µg/L | — | 4.4 m | 2025 |
| 本栖湖 | Yamanashi | 3.0 µg/L | — | 14 m | 2025 |
| 河口湖 | Yamanashi | 12 µg/L | — | 3.5 m | 2025 |
| 精進湖 | Yamanashi | 16 µg/L | — | 2.8 m | 2025 |
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