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 564 metres (1,850 ft) above sea level.

[1] The Ministry of Land, Infrastructure, Transport and Tourism designated the Minami a Class B river.

[4] 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.

[2] 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.

[5] Typhoon Trix in 1971 also caused major flooding, crop damage, and loss of life.