Marunumako Reservoir
| Reservoir Name | Marunumako |
| Dam Name | Marunuma |
| River | Otakigawa |
| Country | Japan |
| Year | 1931 |
| Dam Height | 32 |
| Dam Length | 88 |
| Area(Sqkm) | 0.6 |
| Area(Polygonal) | 0.6 |
| Capital Expenditure | 13.6 |
| Depth(M) | 22.7 |
| Avg Displacement Of Water | 694 |
| Catchment Area In Sqkm | 23 |
| Status | 2: Good |
| Longitude | 139.340417 |
| Latitude | 36.824583 |
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