alluvial soil

English Thesaurus

1. a fine-grained fertile soil deposited by water flowing over flood plains or in river beds (noun.substance)

hypernym	:	dirt, soil,
definition	:	the part of the earth's surface consisting of humus and disintegrated rock (noun.substance)

substance meronym	:	alluvial deposit, alluvial sediment, alluvion, alluvium,
definition	:	clay or silt or gravel carried by rushing streams and deposited where the stream slows down (noun.object)