The pampas are composed of river deposits overlain by loess.

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The Pampas are a fertile South American lowlands that cover more than 750,000 km² and include the Argentine provinces of Buenos Aires, La Pampa, Santa Fe, Entre Ríos, and Córdoba, most of Uruguay, and the southernmost Brazilian state, Rio Grande do Sul. The vast plains are composed of river deposits, including silt and clay, which are overlain by loess, a fine, wind-blown sediment that contributes to the region's fertility. This combination of river deposits and loess has created a landscape ideal for agriculture, particularly for crops like soybeans and wheat, as well as for cattle grazing.

The Pampas Are Composed of River Deposits Overlain by Loess