Obitsu
| Obitsu | ||
 The Obitsu Dam in Kisarazu. |
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| Data | ||
| location | Chiba Prefecture , Japan | |
| River system | Obitsu | |
| origin | Motokiyosumi Mountain, Kimitsu , Chiba Prefecture | |
| muzzle |
Tokyo Bay Coordinates: 35 ° 24 ′ 31 ″ N , 139 ° 53 ′ 54 ″ E 35 ° 24 ′ 31 ″ N , 139 ° 53 ′ 54 ″ E |
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| Mouth height |
0 m
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| length | 88 km | |
| Catchment area | 273.2 km² | |
The Obitsu ( Japanese 小 櫃 川 , -gawa ) is a river in Japan . It is located in Chiba Prefecture and flows into Tokyo Bay .
Geography and fauna
Overall, the river stretches over 88 km with a catchment area of 273.2 km². The origin lies in the densely forested valleys around the mountain Motokiyosumi (height 344 m) of the Bōsō hill country , from where it flows through Kimitsu , Kisarazu and Sodegaura before it flows into the bay of Tokyo. This makes the Obitsu the second largest river in Chiba Prefecture, only surpassed by the Tone , which is 322 km long. In the upper reaches of the Obitsu flows meandering through Kimitsu, in the middle rather straight through Kisarazu and in the lower reaches it finally branches into a triangular delta in Sodegaura, which is known as Banzu-Watt . After a short swing to the west back to Kisarazu, the confluence with Tokyo Bay takes place.
The Obitsu mudflats are home to many species of birds and crustaceans. In 2012, a species of fiddler crab named Uca lactea lactea on the Red List of Endangered Species was discovered, which is probably the northernmost known habitat of this species in Japan.
The river Koito stems from the similar Obitsu from Mount Motokiyosumi where he east on Bōsō Peninsula flows into Tokyo Bay. These two rivers are the longest in the western region of the peninsula.
Kamegawa Dam
The Kamegawa Dam was built near the Kazusa-Kameyama Station on the JR East Kururi Railway on the upper reaches of the river in 1979. This dam forms the Kameyama Reservoir , which is the largest water reservoir in Chiba Prefecture with a diameter of 35 km.
Tributaries
| Surname | length | Catchment area |
|---|---|---|
| Matsu River ( 松川 -gawa ) | 10.4 km | 25.6 km² |
| Yarimizu River ( 槍 水 川 -gawa ) | 3.6 km | 2.84 km² |
| Takeda River ( 武田 川 -gawa ) | 15.2 km | 16.7 km² |
| Hasentakeda River ( 派 川 武田 川 -gawa ) | 1.5 km | 1 km² |
| Nanamagari River ( 七 曲 川 -gawa ) | 8 kilometers | 8.14 km² |
| Ohara River ( 御 腹 川 -gawa ) | 17.1 km | 23.8 km² |
| River Ōmori ( 大 森川 -gawa ) | 2.6 km | 10.4 km² |
| Sasa River ( 笹 川 -gawa ) | 21 km | 22.6 km² |
| Inokawa River ( 猪 ノ 川 ) | - | - |
| Shichiri River ( 七里 川 -gawa ) | - | - |
Historical
prehistory
The first signs of human settlement in the Obitsu area could be found on the basis of finds from large Køkkenmøddinger ( kaizuka ) from the Jōmon period around 14,000 - 300 BC. Be proven. These clam shells are the largest in Japan. The Gion clam pile ( 祇 園 貝 塚 , Gion-kaizuka ) in the Gion district of Kisarazu on Obitsu comes from the middle Jōmon period. There is evidence that Obitsu was colonized to a greater extent in the Yayoi period from approx. 300-200 BC. BC, and the entire eastern area of the Bōsō Peninsula was repopulated in the subsequent Kofun period from 250 - 538 AD.
Edo period
Trade and overwater transportation developed slowly to connect the agriculturally lush middle and upper regions of Obitsu, and peaked there in the Edo period from AD 1603 to 1868. The Tokugawa shogunate was very interested in products from Kazusa Province . For this purpose, the meandering middle course of the Obitsu river was widened and straightened so that new arable land for the cultivation of rice and lotus flowers ( renkon ) could be gained. As on the Yōrō and the Koito, small river boats were used for shipping. Rice was delivered from the Kururi region in Kimitsu as a tribute ( nengu ) to the shogunate. Charcoal , an extremely important product in the Edo period, was produced in the central region of the peninsula and also shipped as one of the main merchandise of river navigation. In the most prosperous period, 35 river boats were active in trade, most of them owned by individual villages along the river. The Obitsu estuary became a lively trading post, as the port of Kisarazu held the exclusive maritime trade rights between the western peninsula and the Edo capital.
Modern
The lower reaches of the Obitsu towards Tokyo Bay was expanded in the early 20th century to support the industrial facilities and facilities growing there on the bay. This area eventually developed into an important part of the Keiyō Industrial Zone . Despite the industrial expansion of the lower reaches, the middle and upper river areas were reserved exclusively for the cultivation of rice and vegetables. In the area around Nagasuka in Kisarazu, lotus flowers were traditionally grown on a large scale. The low, humid river areas were converted into rice fields and fields for growing the lotus. This lotus became popular in the Tokyo area at the end of the Edo period and is still cultivated today. In addition, the shallow Banzu Watt represented the largest cultivation area for seaweed ( nori ) in the Tokyo Bay area.
Recreational use
Kimitsu
The Kameyama Reservoir offers several tourist facilities. There is a hiking trail around the lake, there is a campsite and it is the only place in Chiba Prefecture where bait fishing is permitted. The reservoir can be accessed via the Kururi Railway from JR East by getting off at Kazusa-Kameyama Station.
Kisarazu
The lotus fields of Kisarazu can be reached via Obitsuzeki Park ( 小 櫃 堰 公園 , Obitsuzeki Kōen ) at 358 Gion, Kisarazu, Chiba. The park is a 10-minute walk from the Gion station on the Kururi railway line.
Sodegaura
Collecting mussels and oysters in the Obitsu's Banzu mudflats is very popular.
Web links
Individual evidence
- ↑ a b Highly endangered crab species, Uca lactea lactea, first discovery at Tokyo Bay at mouth of Obitsu River in Kisarazu newspaper Auf: Chiba Nippo
- ↑ Rekishi Digital Dictionary ( memento of the original from August 25, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Chibabox Wiki ( Memento of the original from January 19, 2013 in the web archive archive.today ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Aruke.net
- ↑ Chiba Kenshi Hensan Shingikai: Chiba-ken shiryō . Ed .: Chiba-ken. v.1, Genshi kodai hen, Kazusa-no-kuni, 1967, p. 6 .
- ↑ Chiba Kenshi Hensan Shingikai: Chiba-ken shiryō . Ed .: Chiba-ken. v.1, Genshi kodai hen, Kazusa-no-kuni, 1967, p. 52-63 .
- ↑ a b Takahasi Sumihisa: Bōsō no nenrin . Ed .: Sōjusha. Tokyo 1972, p. 49 .
- ↑ Port of Kisarazu
- ↑ a b Kisarazu Tourist Spot ( Memento of the original from April 15, 2012 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ City of Kimitsu in Chiba ( Memento of the original from August 1, 2012 in the web archive archive.today ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
