Obitsu River
| Obitsu River | |
|---|---|
|
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| Native name | 小櫃川 |
| Country | Japan |
| Basin features | |
| Main source | Mount Motokiyosumi (元清澄山 Motokiyosumi-san?), Kimitsu, Chiba Prefecture |
| River mouth |
Tokyo Bay, Kisarazu, Chiba Prefecture 0 m (0 ft) |
| Basin size | 273.2 km2 (105.5 sq mi) |
| Physical characteristics | |
| Length | 88 km (55 mi) |
Coordinates: 35°24′31″N 139°53′54″E / 35.40861°N 139.89833°E
The Obitsu River (小櫃川 Obitsu-gawa?) is a river in Kimitsu, Kisarazu, and Sodegaura, Chiba Prefecture, Japan. The river is 88 kilometers (55 mi) in length and has a drainage area of 273.2 square kilometers (105.5 sq mi).
The Obitsu emerges from the densely forested valleys around Mount Motokiyosumi (344 meters (1,129 ft)) in the Bōsō Hill Range and empties into Tokyo Bay. It is the second largest river in Chiba Prefecture after the Tone River (322 kilometers (200 mi)). The upper reaches of the Obitsu meander through Kimitsu, the middle of the river runs more directly through Kisarazu, and the lower reaches form and estuary and a triangular delta in Sodegaura, an area known as the Banzu Tidal Flats. The Obitsu then turns briefly west back into Kisarazu to empty into Tokyo Bay. The tidal flats of the Obitsu host numerous species of birds and crustaceans. In 2012 an IUCN Red List endangered species crab, Uca lactea lactea, was discovered at the mouth of the river, and may be the northernmost habitat of the crab in Japan.
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