Map 2. The Northern Tallgrass Prairie Ecoregion (shaded in green). Portions of the ecoregion have already been classified and areas of biodiversity significance selected (these areas are hatched). The areas remaining to be classified and assessed include the Red River basin and lower Assiniboine basin in the northern half of the NTPE (these areas are pictured in orange), and the Big Sioux River basin and Rock River Basin in the southern half of the NTPE.
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