The Spirit Lake Tribe (in Santee Dakota: Mni Wakan Oyate, formerly Devils Lake Sioux) is a federally recognized Sisseton Wahpeton tribe based on a reservation located in east-central North Dakota on the southern shores of Devils Lake. Established in 1867 in a treaty between Sisseton Wahpeton Bands and the United States government, the reservation, at 47°54′38″N 98°53′01″W, consists of 1,283.777 km² (495.669 sq mi) of land area primarily in Benson and Eddy counties.
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