| Lake Suigetsu | |
|---|---|
 Mikata five lakes; Lake Suigetsu is the largest one in the middle Made based on National Land Image Information (Color Aerial Photographs), Ministry of Land, Infrastructure, Transport and Tourism | |
  Lake Suigetsu | |
| Location | Fukui Prefecture |
| Coordinates | 35°35′N 135°53′E / 35.583°N 135.883°E |
| Type | tectonic |
| Primary inflows | From the Hasu River via neighbouring Lake Mikata. |
| Basin countries | Japan |
| Max. length | 2 km (1.2 mi) |
| Max. width | 2 km (1.2 mi) |
| Surface area | 4.3 km2 (1.7 sq mi) |
| Average depth | 34 m (112 ft) |
| Surface elevation | 0 m (0 ft) |
| Settlements | Wakasa, Fukui |
| References | suigetsu project |
Lake Suigetsu (水月湖, Suigetsu-ko) is a lake in the Hokuriku region of Honshu, Japan, which is one of the Mikata Five Lakes located in Mihama and Wakasa, Fukui Prefecture (west-central Honshu), close to the coast of the Wakasa Bay in the Sea of Japan. Since 1993, it has been attracting the attention of scientists because of the undisturbed nature of the water for many thousands of years. It is possible to identify the annual deposits of silt in a similar manner that tree rings are identified.
The area of the lakes is now part of the Wakasa Bay National Park.