Spirit Mound, South Dakota: August 25, 1804

On this very hot day, Lewis, Clark, and ten other expedition members traveled north roughly 9 miles from the mouth of the Vermillion River to visit a solitary hill said by local tribes to be inhabited by, in Clark's words (and spelling), "deavels in humon form with remarkable large heads armed wit Sharp arrows." The men saw no devils, but did see large herds of bison.

Landsat 7 and DEM
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