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 as the authority reports it.
Lake map
Map shows 20 lakes with coordinates
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.
- 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 measure. Open a lake page for the authority's values.
Clearest lakes in other countries
Named lakes and official measurements
Directory of official lake water quality
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Where to stay near South Korea
Stays near the clearest measured lakes in South Korea — live availability from Booking.com, Vrbo and Expedia.
Top-rated places to stay near South Korea
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