| Ōitagawa Dam | |
| Location: | Ōita Prefecture |
| Dam Length: | 515 m |
| Dam Height: | 85.5 m |
| Dam Volume: | 4.16 million m3 |
| Construction Began: | 1978 |
| Opening: | 2020 |
| Res Capacity Total: | 25.9 million m3 |
| Res Catchment: | 38 km2 |
| Res Surface: | 1.1 km2 |
| Coordinates: | 33.1267°N -131.4969°W |
| Country: | Japan |
| Purpose: | Flood control |
Nanase Dam is a dam in the Ōita Prefecture, Japan, which was completed in 2020. It is mainly dedicated to flood control, with a retention capacity of 25.9 million cubic meters of water.[1] [2] It was previously known as Oitagawa Dam but was renamed on completion.