The Standing Rock Reservation (/inyan bosdata) is located in North Dakota and South Dakota in the United States. It is where the "Hunkpapa and Sihasapa bands of Lakota Oyate and the Ihunktuwona and Pabaksa bands of the Dakota Oyate" live. The sixth-largest Native American reservation in land area in the US, Standing Rock includes all of Sioux County, North Dakota, and all of Corson County, South Dakota.