Clearest lakes in South Korea
Clearest lakes in South Korea: 76 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 South Korea
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| 화천댐 | — | 10 µg/L | 1.5 µg/L | 4.5 m | 2025 |
| 충주댐 | — | 10 µg/L | 1.8 µg/L | 4.0 m | 2025 |
| 대아지 | — | 6.0 µg/L | 3.2 µg/L | 3.6 m | 2025 |
| 안동댐 | — | 16 µg/L | 1.3 µg/L | 3.2 m | 2025 |
| 주암조정지댐 | — | 12 µg/L | 3.4 µg/L | 3.2 m | 2025 |
| 성덕댐 | — | 10 µg/L | 3.2 µg/L | 3.0 m | 2025 |
| 소양강댐 | — | 9.0 µg/L | 1.2 µg/L | 3.0 m | 2025 |
| 밀양댐 | — | 10 µg/L | 1.5 µg/L | 2.8 m | 2025 |
| 경천지 | — | 13 µg/L | 5.2 µg/L | 2.7 m | 2025 |
| 김천부항댐 | — | 14 µg/L | 4.7 µg/L | 2.7 m | 2025 |
| 대청댐 | — | 16 µg/L | 2.7 µg/L | 2.7 m | 2025 |
| 주암댐 | — | 14 µg/L | 4.4 µg/L | 2.7 m | 2025 |
| 임하댐 | — | 22 µg/L | 1.4 µg/L | 2.6 m | 2025 |
| 남강댐 | — | 15 µg/L | 3.3 µg/L | 2.5 m | 2025 |
| 담양댐 | — | 12 µg/L | 3.3 µg/L | 2.5 m | 2025 |
| 부안댐 | — | 8.0 µg/L | 1.8 µg/L | 2.5 m | 2025 |
| 섬진강댐 | — | 10 µg/L | 2.8 µg/L | 2.5 m | 2025 |
| 연초댐 | — | 20 µg/L | 3.0 µg/L | 2.5 m | 2025 |
| 용담댐 | — | 9.0 µg/L | 2.8 µg/L | 2.5 m | 2025 |
| 의암댐 | — | 15 µg/L | 6.1 µg/L | 2.5 m | 2025 |
Showing 20 of 76 named lakes. Open a county or place page for the rest.
Frequently asked questions
- Which lakes in South Korea are the clearest?
- 76 named lakes in South Korea 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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