Plain - Heiya (English spelling)

Japanese: 平野 - へいや（英語表記）plain

A relatively flat landform with few irregularities on the surface. They are broadly divided into sedimentary plains and erosional plains based on the cause of their formation. Sedimentary plains are formed mainly by river deposition, and include alluvial fans, deltas, natural levees, and back marshes. Seabeds that are formed by marine depositional surfaces are called coastal plains. Sedimentary plains often develop in new mountain-building regions, such as Japan. Erosional plains are areas where undulating mountains have been worn down and flattened by the erosive action of running water, glaciers, wind, etc., and are widely distributed in old continental massifs and old orogenic belts with stable ground.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

地表の凹凸の少い比較的平坦な地形をいう。形成原因により堆積平野と浸食平野に大別される。堆積平野は主として河川の堆積作用によって生じたもので，扇状地と三角州，自然堤防帯，後背湿地などを含む。また海成堆積面が離水したものは海岸平野と呼ぶ。堆積平野は日本など新しい造山地域に多く発達する。浸食平野は流水，氷河，風などの浸食作用によって起伏ある山地が削られて平坦化したところで，地盤の安定した古大陸塊や古い造山帯に広く分布する。

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