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28-664: The Koito River ( 小糸川 , Koito-gawa ) is a river in Futtsu and Kimitsu , Chiba Prefecture , Japan . The river is 82 kilometers (51 mi) in length and has a drainage area of 148.7 square kilometers (57.4 sq mi). The Koito is the third-longest river in Chiba Prefecture, and under the Rivers Act of 1906 the Koito is designated as a Class 2 River. The name of the river in Japanese

56-580: Is 15.7 °C. The average annual rainfall is 1695 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.5 °C, and lowest in January, at around 6.0 °C. Per Japanese census data, the population of Futtsu has declined in recent decades. The area of modern Futtsu has been inhabited since the Japanese Paleolithic period, and numerous remains from

84-498: Is a city located in Chiba Prefecture , Japan . As of 1 November 2020 , the city had an estimated population of 42,476 in 18,115 households and a population density of 210 persons per km . The total area of the city is 205.53 square kilometres (79.36 sq mi). Futtsu is located in the southern part of Chiba prefecture, about 40 kilometers from the prefectural capital at Chiba and 40 to 50 kilometers from

112-672: Is a combination of two kanji characters, the first meaning “little”, and the second meaning “ thread ”. The Koito River originates from a deep valley in forests around Mount Kiyosumi in the Bōsō Hill Range . The river cuts through the Kazusa Hill Range , a smaller part of the Bōsō Hill Range, and in its upper part, meanders northwest. The Koito creates picturesque ravines throughout the Bōsō Hill Range , and passes by Mount Karasuba and Mount Kiyosumi . The middle and lower parts of

140-749: Is defined by the Bōsō Peninsula , the Miura Hills , Tokyo Bay , and Sagami Bay . The Kashima Sea and Kujūkuri Beach define the eastern end of the plain. Most of its rivers originate in the northern or western mountain ranges and flow east or southeast into the Pacific Ocean , Tokyo Bay , or Sagami Bay . In the central part of the plain is the Tone River ; in the northern part the Watarase River , Kinu River , Kokai River, Naka River , and Kuji River ; and in

168-459: Is recorded several times during the winter. Throughout the year, the entire Kanto Plain, especially the inland areas, are easily affected by radiative cooling due to clear skies and north winds, so the minimum temperature before sunrise can drop to about 5 degrees below zero in winter. Even on days when the temperature drops at dawn, the daytime temperature rises to about 7 to 10 degrees Celsius on sunny days, and on days with strong dry north winds,

196-592: The Bōsō Peninsula . The Koito River is associated with the Dairizuka Kofun Group in Futtsu, which was active from the 5th to 7th century. The group exhibits not only at least 47 kofun but also excellent examples of haniwa funerary objects. The area around the mouth of the Koito River is the historical center of Chiba Prefecture's nori seaweed industry. Futtsu, Chiba Futtsu ( 富津市 , Futtsu-shi )

224-700: The Jōmon , Yayoi and Kofun period have been found within the city limits. The area also is prominent in the Yamatotakeru mythology. Under the Ritsuryō system of the Nara period , the area became part of Amaha County and Sue County of Kazusa Province . Large scale shōen in the Heian period gave way to feudal samurai estates in the Kamakura period , with large portions controlled by

252-668: The lower house of the Diet of Japan . Futtsu has a mixed economy based on commercial fishing , agriculture, tourism, and electrical power generation.The Futtsu Power Station is one of the largest thermal power plants in the world; it is fed with liquefied natural gas brought it by LNG carrier ocean ships. The southern portion of the city is within the Keiyo Industrial Zone, with metal products, general machinery and equipment manufacturing factories. Futtsu has eight public elementary schools and three public middle schools operated by

280-547: The Japanese mainland following the declared surrender. This was a test whether the Japanese would obey the Emperor's surrender order. There was no resistance. Futtsu has a mayor-council form of government with a directly elected mayor and a unicameral city council of 16 members. Futtsu contributes one member to the Chiba Prefectural Assembly. In terms of national politics, the city is part of Chiba 12th district of

308-512: The Kanto Plain is temperate, with a Pacific Ocean side climate. Winters are cold and summers are hot. The further inland, the greater the temperature difference between summer and winter, and within a day. There are relatively many hours of sunshine, especially in the northern part. Due to the influence of the Black Current (warm current) flowing along the coast, the climate is mild, especially in

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336-522: The Koito feature fluvial terraces . Extensive land reclamation was carried out near the mouth of the river, and this land was used to build the Nippon Steel Kimitsu Works . The Kimitsu Works sits on the north bank of the Koito River where it empties in Tokyo Bay . The Koito River has numerous narrow points along its course, and flooding has been a frequent problem. In the middle part of

364-575: The Sayama Hills and Tama Hills , typically, undulating between 100 and 200 m above sea level. Hills located at the western edge of the Kantō Plain, the Hiki Hills, Koma Hills, Kusahana Hills, and Kaji Hills, also reach approximately 200 m (660 ft) above sea level. The overall tilt of the plateaus and hills is noteworthy. In general, the whole area is slightly bent and forming a basin centered in

392-574: The Tone River and Tokyo Bay. The ongoing process of tectonic extension continues as the plain's central region gradually sinks. The Kantō Plain witnessed its greatest devastation from an earthquake on 1 September 1923 , with a death toll calculated of 142,807. Kanto Plain was formed by the Kanto basin-forming movement, which has continued since the Neogene period . This movement is what caused sedimentation in

420-707: The center of Tokyo. It is on the southwest coast of Bōsō Peninsula , facing the Uraga Channel at the southern end of Tokyo Bay . Cape Futtsu protrudes into Tokyo Bay, and the coastal areas are part of the Minami Bōsō Quasi-National Park . Although considered to be within the Kantō Plain , inland areas of the city are hilly. Chiba Prefecture Futtsu has a humid subtropical climate (Köppen Cfa ) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Futtsu

448-579: The center of the present-day Kanto Plain and uplift of the surrounding mountains. As a result, sediment from the surrounding mountains was deposited very thickly (the Tertiary layer reaches as high as 3,000 meters) and further uplifted to form many hills and plateaus. Large tectonic lines such as the eastern margin of the Fossa Magna and the Median Tectonic Line are thought to exist in the central part of

476-624: The city government, and two public high schools operated by the Chiba Prefectural Board of Education. [REDACTED] JR East – Uchibō Line Kant%C5%8D Plain 36°00′N 140°00′E  /  36.000°N 140.000°E  / 36.000; 140.000 The Kantō Plain ( Japanese : 関東平野 , Hepburn : Kantō heiya ) , in the Kantō region of central Honshu , is the largest plain in Japan . Its 17,000 km covers more than half of

504-782: The cool air brought in by the Yamase, resulting in a cold summer. In winter, the monsoon from the Sea of Japan is blocked by the Mikuni Mountains, and the moisture falls as snow along the mountains to the north, and the monsoon that has lost its moisture blows through the Kanto Plain as a strong gale carrying dry air (such as Akagi Orosi in Gunma Prefecture , Tsukuba Orosi in Ibaraki Prefecuture and Futaara Orosi). Snowfall has been decreasing year by year, but snow accumulation of around 10–20 cm

532-488: The plain, but this thick accumulation of soft sedimentary layers makes it difficult to find active faults that can cause earthquakes (faults exist in the base 3000m below the sedimentary layers). In addition, natural sediments such as sediment carried by rivers have been used to create land, and the terrain was almost the same as it is today in the Late Jomon to Early Yayoi Period (more than 3,000 years ago). The climate of

560-535: The plateaus, the Musashino Plateau has the largest stretch of land, extending from the western edge of Ōme to the eastern edge of Yamanote , which borders the alluvial plains of the Arakawa and Sumida Rivers. Its elevation gradually declines from west to east, measuring 190 m at Ōme and 20 m at Yamanote. Hills in the Kantō Plain stand on Tertiary strata and rise higher than surrounding plateaus, exemplified by

588-640: The region extending over Tokyo , Saitama Prefecture , Kanagawa Prefecture , Chiba Prefecture , Gunma Prefecture , Tochigi Prefecture , and Ibaraki Prefecture . The northern limit borders on the Abukuma Highlands , Yamizo Mountain Range , Ashio Mountain Range, and a volcanic field associated with the Nasu Volcanic Belt. The western coincides with the Kantō Mountain Range , and the southern edge

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616-462: The river appears as the "Susu River", or possibly the "Sue River", of Sutō District; in its lower reaches it appears with its present-day name as the Koito River in Susai District. The current name of the river, however, appears in one work as early as 1662, and in the 'Nakatomi kyōdoshi' in 1674. The earliest settlements in the southern part of Chiba Prefecture were via the numerous small rivers on

644-592: The river there were floods in 1996 and 2006. The Mishima Dam was built on the Koito due to prevent drought on the upper and middle parts of the river, and the Toyofusa Dam was built on the upper part of the river to prevent water shortages and supply water for industrial purposes. In the third chapter of the Gikeiki , which dates to the 14th century, the Koito River is called the "Sue River". In Kubo Tadayasu's Edo period illustrations of Kazusa Province domains in 1699

672-507: The southern part the Arakawa River , Tama River , and Sagami River . Of these, the Tone River encompasses a large area of floodplain, for its drainage area of 16,840 km (6,500 sq mi) is the largest in Japan. The drainage areas covered by these rivers account for the alluvial lowland of the Kantō Plain. A collection of plateaus constitute a large part of the plain. Among them are

700-439: The southern part. In summer, rainfall is heavy due to the rainy season front caused by monsoon, and typhoons are often seen. Thunderclouds that form in the northern to western mountains areas before noon reach the plains in the early afternoon, often resulting in evening showers (thunderstorms). In years when Okhotsk anticyclone prevails, the winds from this anticyclone become northeasterly winds, and temperatures do not rise due to

728-728: The temple of Shomyo-ji in Mutsuura . The area was contested between the Takeda clan and Satomi clan during the Sengoku period . During the Edo period under the Tokugawa shogunate , most of the area was under the control of Sanuki Domain . After the Meiji Restoration , the area came under Kimitsu District Futtsu village was established with the creation of the modern municipalities system on April 1, 1889. It

756-465: The Ōmiya, Musashino , Sagamino , Jōsō , and Shimōsa Plateaus. These large plateaus are divided into smaller ones by shallow river valleys. A common feature of the plateaus is that their surfaces are covered with a thick layer of loam of volcanic origin. Volcanic ash from surrounding volcanoes, Mounts Asama , Haruna , and Akagi to the north and Mounts Hakone and Fuji to the southwest, are thought to have been deposited on these plateaus. Among

784-407: Was elevated to town status on December 1, 1897. Futtsu expanded through merger with neighboring Aoyagi Town on March 31, 1955, and again through merger with Amaha Town and Osawa Town on April 25, 1971. Futtsu attained city status on September 1, 1971. According to Victory at Sea (H. Saloman and R. Hanser, Doubleday , 1959), Futtsu was on August 30, 1945 the site of the initial Allied landing on

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