The , also translated as Musashino Platform and also named as Musashino Region, is a large

tableland A table or tableland is a butte, flank of a mountain, or mountain, that has a flat top. This kind of landform has numerous names, including: * Butte * Mesa * * Potrero * Tepui * Terrace * Tuya A tuya is a flat-topped, steep-sided vol ...

(known as a

fluvial terrace Fluvial terraces are elongated terraces that flank the sides of floodplains and fluvial valleys all over the world. They consist of a relatively level strip of land, called a "tread", separated from either an adjacent floodplain, other fluvial te ...

) in the

Kantō region The is a geographical area of Honshu, the largest island of Japan. In a common definition, the region includes the Greater Tokyo Area and encompasses seven prefectures: Gunma, Tochigi, Ibaraki, Saitama, Tokyo, Chiba and Kanagawa. Slight ...

Honshu , historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separ ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. The Musashino Plateau is a

plateau In geology and physical geography, a plateau (; ; ), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. Often one or more sides ha ...

that extends between the Arakawa and Tama Rivers.

Origin

It consists of an

alluvial fan An alluvial fan is an accumulation of sediments that fans outwards from a concentrated source of sediments, such as a narrow canyon emerging from an escarpment. They are characteristic of mountainous terrain in arid to semiarid climates, but a ...

formed by the ancient Tama River with a layer of volcanic ash on top, many meters deep. The Tama River, which flowed downward as it carved the Okutama Mountains, formed a large alluvial fan with Ōme as the top of the fan. This alluvial fan is the base of the Musashino Plateau, and on it the Kantō Loam Formation is deposited with a thickness of approximately 5 to 15

meters The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its prefi ...

. The Kantō Loam Formation is primarily andesite or basaltic sandy mud that was formed by volcanic ash from

Mount Fuji , or Fugaku, located on the island of Honshū, is the highest mountain in Japan, with a summit elevation of . It is the second-highest volcano located on an island in Asia (after Mount Kerinci on the island of Sumatra), and seventh-highest p ...

that was carried by the west wind and deposited.

Terraces

Two types of developed river terraces can be seen on the Musashino Plateau. One is formed by the Tama River flowing on the south side, and the lowest terrace (low surface) is called Tachikawa terrace, and the terrace one step higher than that (high surface) is called Musashino terrace. The other is found in the north and is thought to be a remnant of the former Tama River channel.

Location

The plateau is located to the northwest of

Tokyo Bay is a bay located in the southern Kantō region of Japan, and spans the coasts of Tokyo, Kanagawa Prefecture, and Chiba Prefecture. Tokyo Bay is connected to the Pacific Ocean by the Uraga Channel. The Tokyo Bay region is both the most populous a ...

. It is a plateau within the

Kantō plain The is the largest plain in Japan, and is located in the Kantō region of central Honshū. The total area of 17,000 km2 covers more than half of the region extending over Tokyo, Saitama Prefecture, Kanagawa Prefecture, Chiba Prefecture, ...

, in the southwest of that plain. Much of

Tokyo Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, with an estimated 37.468 ...

, between the

Tama River The is a major river in Yamanashi, Kanagawa and Tokyo Prefectures on Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government. Its total length is , and the total of the river's basin area spans . The river ...

to the south and the

Arakawa River or Ara River may refer to: * Arakawa River (Kanto) or Ara River may refer to: * Arakawa River (Kanto), which flows from Saitama Prefecture and through Tokyo to Tokyo Bay * Arakawa River (Uetsu), which flows from Yamagata Prefecture and throu ...

to the north, is built on the plateau. Its northern section is located in southern

Saitama Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Saitama Prefecture has a population of 7,338,536 (1 January 2020) and has a geographic area of 3,797 km2 (1,466 sq mi). Saitama Prefecture borders Tochigi Prefecture ...

References

Landforms of Tokyo Landforms of Saitama Prefecture Plateaus of Japan {{Regional-geology-stub