Paha are elongated landforms built of loess alone, or of till capped by loess. In Iowa, paha are prominent hills running from northwest to southeast, formed during the same period of erosion that carved the Iowan surface, and they are treated as erosional remnants because they often preserve buried soils beneath them. They typically rise more than 6.1 meters above the surrounding land. The word paha means hill in the Dakota Sioux language, and the same kind of landform occurs elsewhere in the United States and, under the name greda, in Europe.
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