The Musashino Terrace also translated as Musashino Platform, is a large platform of land, known as a river terrace, in the Kantō region

Kanto region

The is a geographical area of Honshu, the largest island of Japan. The region includes the Greater Tokyo Area and encompasses seven prefectures: Gunma, Tochigi, Ibaraki, Saitama, Tokyo, Chiba, and Kanagawa. Within its boundaries, slightly more than 40 percent of the land area is the Kantō Plain....

 of Honshū

Honshu

is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...

, Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

.

Much of western Tokyo

Western Tokyo

Western Tokyo, also known as the , or , consists of the part of Tokyo Prefecture to the west of the 23 special wards.-Overview:Whereas the special wards occupy the space that was formerly the city of Tokyo, western Tokyo consists of the 26 cities, three towns, and one village that were not part of...

, between Tama River

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....

 to the south and Arakawa

Arakawa River

The is one of the principal rivers flowing through Tokyo, the capital city of Japan. The point of origin is on Mount Kobushi in Saitama Prefecture, and the Arakawa River empties into Tokyo Bay, spanning 173 kilometers. The drainage basin covers 2,940 square kilometers...

 to the north, is built on the terrace. Its northern section is located in southern Saitama Prefecture

Saitama Prefecture

is a prefecture of Japan located in the Kantō region of the island of Honshu. The capital is the city of Saitama.This prefecture is part of the Greater Tokyo Area, and most of Saitama's cities can be described as suburbs of Tokyo, to which a large amount of residents commute each day.- History...

.

It consists of an alluvial fan

Alluvial fan

An alluvial fan is a fan-shaped deposit formed where a fast flowing stream flattens, slows, and spreads typically at the exit of a canyon onto a flatter plain. A convergence of neighboring alluvial fans into a single apron of deposits against a slope is called a bajada, or compound alluvial...

formed by an ancient River Tama with a layer of volcanic ash, many metres deep, on top.