Omiya Plateau - Omiyadaichi

A plateau stretching between the Arakawa and Moto-Arakawa rivers in the southeastern part of Saitama prefecture, its surface is covered with a layer of Kanto loam several meters thick. Its long axis runs from northwest to southeast, with an elevation of 30 meters in the northern area near Kitamoto city and 20 meters in the southern area near the Hatogaya district of Kawaguchi city, but the central area is lower. The southern half of the plateau is carved by the Kamo River, Shiba River, and Ayase River, forming a long, narrow valley running north-south. There are cliffs 5 to 10 meters between it and the alluvial lowland, but there are no cliffs in the northeastern part. Cities such as Saitama and Ageo have developed here, and the Tohoku-Joetsu Shinkansen, Tohoku Main Line, Takasaki Line, and National Route 17 run through it, making it the political and economic center of Saitama prefecture.

[Masatami Nakayama]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

埼玉県南東部、荒川と元荒川との間に広がる台地で、表面は数メートルの関東ローム層で覆われる。北西から南東に長軸をもち、高度は北部の北本(きたもと)市付近で30メートル、南部の川口市鳩ヶ谷(はとがや)地区付近で20メートルであるが、中央部は低い。台地の南半部は鴨(かも)川、芝(しば)川、綾瀬(あやせ)川によって刻まれ、南―北方向の細長い谷をつくる。沖積低地との間は、5～10メートルの崖(がけ)をなすが、北東部には崖はない。さいたま、上尾(あげお)などの都市が発達し、東北・上越新幹線、東北本線、高崎線、国道17号が通り埼玉県の政治、経済の中心地帯となっている。

［中山正民］

出典　小学館　日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について　情報 | 凡例