A hill range in central Tochigi Prefecture, stretching from the eastern foot of Mt. Takahara to the southeast. It is also called the Shiona Hills, as it is the border between Shioya and Nasu counties. It is mainly composed of Quaternary layers, and has an elevation of 200-300m. It is gently undulating and lowers to the southeast, forming the watershed between the Naka River and the Kinu River. The Egawa and Arakawa rivers, which flow to the southeast, are tributaries of the Naka River, and have eroded the hills to create dendritic valleys and are highly meandering. River terraces have developed along the coast, and the small Karasuyama basin is located at the confluence. The lower river terraces are used for rice paddies, the higher river terraces for farmland, and the hill slopes are mainly for farmland and forests. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
栃木県中部,高原山東麓から南東に及ぶ丘陵。塩谷,那須両郡の境界になるので,塩那丘陵とも呼ばれる。主として第四紀層から成り,標高は 200~300m。ゆるやかな起伏で南東に低くなり,那珂川,鬼怒川両流域の分水界にあたる。南東に流れる江川,荒川は那珂川の支流で,丘陵を浸食して樹枝状の谷をつくり,蛇行が著しい。沿岸に河岸段丘が発達し,合流点に烏山の小さな盆地がある。低い河岸段丘は水田,高い河岸段丘は畑,丘陵斜面はおもに畑と森林に利用されている。
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