These programs are all managed in cooperation with the local grazing association. The grassland is managed with prescribed grazing, fire, and mowing. Other unique plants found on the grassland include other orchids and ferns. It also contains one of largest populations of the western prairie fringed orchid, which has been placed on the list of Threatened Species by the U.S. The grassland provides habitat for greater prairie chickens in North Dakota as well as several other sensitive species such as the Dakota skipper and Regal Fritillary. It is the only National Grassland in the tallgrass prairie region of the United States. Since that time, wind and rain have shaped the topography into a unique landscape ranging from flat deltaic plains to choppy sand dunes. It is characterized by sandy soils, originally deposited as the delta of an ancient river as it emptied into glacial Lake Agassiz. Sheyenne National Grassland is located in southeastern North Dakota, comprising 70,180 acres (28,400 ha) of public land amid 64,769 acres (26,211 ha) of privately owned land.
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