Jisho

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Noun
1. alluvial plain
Wikipedia definition
2. Alluvial plainAn alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smaller area over which the rivers flood at a particular period of time, whereas the alluvial plain is the larger area representing the region over which the floodplains have shifted over geological time.
Read “Alluvial plain” on English Wikipedia
Read “沖積平野” on Japanese Wikipedia
Read “Alluvial plain” on DBpedia

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