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river in Katsuura,Tokushima

1.Butsubutsu River
The Butsubutsu River (Japanese: ぶつぶつ川) is a second-class river that flows through the Konoshiro district of Nachikatsuura Town, Higashimuro District, Wakayama Prefecture (Japanese: 和歌山県). The total length is 13.5 meters (also: 44 ft) and the river width is around 1 meter. With the designation of a second-class river in 2008, it became the shortest river in Japan under the River Law.
Wikipedia  detail