Clearest lakes in Finland
Clearest lakes in Finland: 3,904 named lakes have an official Secchi depth. The 20 below are ranked by that reading — water clarity, not a LakeQuality A–F grade.
Lake map
Highest Secchi readings in Finland
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Harrijärvi | Inari | 3.0 µg/L | 1.1 µg/L | 11 m | 2023 |
| Särkkäjärvi | Ilomantsi | 3.0 µg/L | 1.0 µg/L | 10 m | 2023 |
| Aittolampi | Kontiolahti | 5.2 µg/L | 1.3 µg/L | 9.9 m | 2024 |
| Valkiajärvi | Kitee | 3.1 µg/L | 1.0 µg/L | 9.8 m | 2026 |
| Ruutana Lake | Orivesi | 7.0 µg/L | 1.1 µg/L | 9.5 m | 2018 |
| Sonnanen Lake | Heinola | 3.0 µg/L | 1.3 µg/L | 9.4 m | 2026 |
| Iso-Riutta Lake | Lempäälä | 12 µg/L | 6.7 µg/L | 8.0 m | 2020 |
| Valkealampi | Joensuu | 3.9 µg/L | 1.0 µg/L | 7.8 m | 2025 |
| Syvälampi | Lohja | 5.0 µg/L | 1.4 µg/L | 7.6 m | 2017 |
| Kuorinka Lake | Liperi | 3.1 µg/L | 1.5 µg/L | 7.5 m | 2025 |
| Hertunjärvi | Mikkeli | 3.8 µg/L | 1.5 µg/L | 7.2 m | 2017 |
| Kilpisjärvi | — | 3.0 µg/L | 1.2 µg/L | 7.2 m | 2026 |
| Heramaanjärvi | Kangasala | 4.4 µg/L | 1.4 µg/L | 7.0 m | 2023 |
| Särkijärvi | Tohmajärvi | 4.2 µg/L | 1.5 µg/L | 7.0 m | 2026 |
| Keskimmäinen Polvijärvi | Kontiolahti | 3.2 µg/L | 1.5 µg/L | 6.9 m | 2023 |
| Niininen Lake | Pieksämäki | 3.3 µg/L | 1.3 µg/L | 6.9 m | 2017 |
| Kuikkalampi | Sotkamo | 4.1 µg/L | — | 6.8 m | 2018 |
| Iso Heinäjärvi | Kitee | 4.1 µg/L | 2.0 µg/L | 6.5 m | 2022 |
| Saarinen Lake | Muhos | 4.9 µg/L | 1.3 µg/L | 6.5 m | 2016 |
| Murtojärvi | Joensuu | 3.9 µg/L | 1.2 µg/L | 6.5 m | 2023 |
Showing 20 of 3,904 named lakes. Open a county or place page for the rest.
Frequently asked questions
- Which lakes in Finland are the clearest?
- 3,904 named lakes in Finland have an official Secchi depth. This page ranks the 20 deepest readings. Secchi is a clarity measurement, not a swim-safety class and not a LakeQuality A–F grade.
- Is clear water the same as clean water?
- No. Secchi measures how far a disk stays visible. A clear lake can still have bacteria, toxins, or contaminants this catalog does not grade. Open a lake page for the authority's values.
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