The Standing Rock Sioux Tribe encompasses the bands of Hunkpapa and Black Feet of the Lakota Nation, and Hunkpatinas and Cuthead bands of the Yanktonias of the Dakota Nation.  The Standing Rock Reservation straddles the border between North and South Dakota about 40 miles south of Bismark, ND.  The reservation encompasses approximately 294,840 acres with a population of 7,956.