Black Elk Peak (formerly Harney Peak) is the highest natural point in South Dakota, United States. It lies in the Black Elk Wilderness area, in southern Pennington County, in the Black Hills National Forest. The peak lies 3.7 mi (6.0 km) west-southwest of Mount Rushmore. At 7,242 feet (2,207 m), it has been described by the Board on Geographical Names as the highest summit in the United States east of the Rocky Mountains. It is also known as Hiŋháŋ Káǧa (in Lakota).
The U.S. Board on Geographic Names, which has jurisdiction in federal lands, officially changed the mountain's name from "Harney Peak" to "Black Elk Peak" on August 11, 2016, honoring Black Elk, the noted Lakota Sioux medicine man for whom the Wilderness Area is named.
Professional but unofficial measurements in 2016 found the highest natural rock to be at 7,231.32 feet (2,204.11 m) NAVD88 and the nearby secondary peak slightly lower at 7,229.41 feet (2,203.52 m).