The Belle Fourche River (prounced bel FOOSH) is a tributary of the Cheyenne River, about 290 miles (470 km) long, in the U.S. states of Wyoming and South Dakota. It is part of the Mississippi River watershed traveling through the Cheyenne and Missouri rivers.

The point at which the river flows out of Wyoming and into South Dakota is the lowest elevation point in the state of Wyoming at 3,099 feet (945 m). This is the second-highest low point of any U.S. state.^[1]

• U.S. Geological Survey Geographic Names Information System: Belle Fourche River
• "The National Map Viewer". U.S. Geological Survey. Retrieved 2012-09-20.

44°26′05″N 102°18′12″W / 44.4347094°N 102.3032179°W / 44.4347094; -102.3032179

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