Definition
Alluvial describes something related to or derived from alluvium. Alluvium is sediment, such as sand, silt, or clay, deposited by flowing water, like rivers or streams. Alluvial soils are often fertile and ideal for agriculture because they are rich in nutrients. Alluvial plains are flat areas formed by the deposition of alluvium over time. Think of it as nature's way of creating fertile land through the gradual buildup of sediment. The Mississippi Delta is a classic example of an alluvial region.