Numata Basin

Located in northern Gunma Prefecture, it is a triangular basin surrounded by mountains such as Akagi, Hotaka, and Komochi. It stretches approximately 13 kilometers from east to west, 9 kilometers from north to south, and is around 300 to 600 meters above sea level. The Tone River on the west side is joined by the Katashina River and the Usune River. Several beautiful river terraces have developed, and Numata City is located on a terrace. Due to the clay layer below the terrace gravel layer, it is believed that the basin was once a lake. There are many mulberry and vegetable fields on the upper terrace surface, and rice paddies on the lower terrace surface. The climate is inland, and Gunma's famous dry winds do not blow.

[Murakami Sadao]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

群馬県北部、赤城(あかぎ)、武尊(ほたか)、子持(こもち)などの山に囲まれた三角形の盆地。東西約13キロメートル、南北約9キロメートル、標高300～600メートル内外。西辺の利根(とね)川に片品(かたしな)川と薄根(うすね)川が合流する。数段のみごとな河岸段丘が発達し、沼田市も段丘上にあり、段丘礫(れき)層の下の粘土層により、盆地はかつて湖であったと考えられている。上位段丘面には桑畑や野菜畑、下位段丘面には水田が多い。気候は内陸的で、群馬名物のからっ風は吹かない。

［村木定雄］

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