Belle Fourche River

The Belle Fourche River (pronounced bel FOOSH; Lakota: Šahíyela Wakpá[1]) is a tributary of the Cheyenne River, approximately 290 miles (470 km) long, in the U.S. states of Wyoming and South Dakota.

[4] It rises in northeastern Wyoming, in southern Campbell County, approximately 18 miles (29 km) southwest of Wright.

It flows northeast around the north side of the Bear Lodge Mountains, past Moorcroft and Devils Tower.

Near the state line with Montana, it turns abruptly southeast and flows in western South Dakota, past Belle Fourche and around the north side of the Black Hills.

The total irrigation area of the river in South Dakota is approximately 57,000 acres (230 km2).