| Minami River | |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | Minami River location in Fukui Prefecture. |
| Subdivision Type1: | Country |
| Subdivision Name1: | Japan |
| Subdivision Type2: | State |
| Subdivision Name2: | Honshu |
| Subdivision Type3: | Region |
| Subdivision Name3: | Fukui |
| Subdivision Type4: | Municipalities |
| Subdivision Name4: | Ōi, Obama |
| Length: | 34km (21miles) |
| Source1: | Tokinzan |
| Source1 Location: | Ōi, Fukui Prefecture and Ayabe, Kyoto Prefecture |
| Source1 Elevation: | 564m (1,850feet) |
| Mouth: | Obama Bay |
| Mouth Location: | Obama, Fukui |
| Mouth Coordinates: | 35.5039°N 135.739°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 460km2 |
The is a river in Fukui Prefecture, Japan. It is designated Class B by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). It empties into Obama Bay, a sub-bay of Wakasa Bay on the Sea of Japan about 280m (920feet) southwest of the mouth of the Kita River.
The source of the Minami River is found near Amaki Pass on the slopes of Tokinzan (a mountain straddling the border between Ōi, Fukui Prefecture and Ayabe, Kyoto Prefecture) about 564m (1,850feet) above sea level. is located a few kilometers below the headwaters of the river. The river travels for 34km (21miles) through the municipalities of Ōi (in Ōi District) and Obama before emptying into Obama Bay right next to the mouths of the Kita and Tada Rivers.
The drainage basin for the river covers 460km2. The Fukaya, Kubotani, and Kuda Rivers in Ōi, and the Makitani, Okutanawa, Sakamoto, Somegatani, Sunawa, and Tamura Rivers in Obama are all tributaries. The Ministry of Land, Infrastructure, Transport and Tourism designated the Minami a Class B river. Japan National Route 162 runs alongside the Minami River from just below the Buddhist temple Dankeiji to near the river's mouth at Obama Bay.
Obama Castle was built on the narrow delta formed by the mouths of the Minami, Kita, and Tada Rivers, giving the castle natural protection due to the rivers and Obama Bay protecting it on three sides.
In September 1953, heavy rainfall from Typhoon Tess caused major flooding along the Minami River and its tributaries, destroying many fields, damaging ships, and injuring or killing almost nearly 500 people. Typhoon Trix in 1971 also caused major flooding, crop damage, and loss of life.
The Minami River has several main tributaries.
The Minami River is home to many types of fish and other animals.