Yamaguchi, Japan
County page for 11 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 |
|---|---|---|---|---|---|
| 大原湖 | Yamaguchi | 8.0 µg/L | — | 4.4 m | 2025 |
| 小野湖 | Yamaguchi | 22 µg/L | — | 2.5 m | 2025 |
| 山代湖 | Yamaguchi | 14 µg/L | — | 3.6 m | 2025 |
| 常盤湖 | Yamaguchi | 20 µg/L | — | 2.0 m | 2025 |
| 弥栄湖 | Yamaguchi | 8.5 µg/L | — | 5.8 m | 2025 |
| 米泉湖 | Yamaguchi | 21 µg/L | — | 3.0 m | 2025 |
| 菅野湖 | Yamaguchi | 13 µg/L | — | 3.5 m | 2025 |
| 菊川湖 | Yamaguchi | 23 µg/L | — | 2.5 m | 2025 |
| 豊田湖 | Yamaguchi | 16 µg/L | — | — | 2024 |
| 阿武湖 | Yamaguchi | 12 µg/L | — | 4.0 m | 2025 |
| 高瀬湖 | Yamaguchi | 27 µg/L | — | 2.5 m | 2025 |
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