The Little Missouri River, or Little Mo, is a 147-mile-long (237 km)[2] waterway that runs from the Ouachita Mountains of southwest Arkansas into the rolling hills area in the surrounding countryside.

This river has numerous small waterfalls, crystal clear water, and outstanding scenery including towering rocky bluffs crowned with pine.

The upper reaches of the Little Missouri were considered so scenic that the area was once approved by Congress to become Ouachita National Park, until this action was vetoed by President Herbert Hoover.

[4] During the American Civil War the Battle of Elkin's Ferry was fought on the Little Missouri, 10 miles (16 km) north of Prescott, Arkansas, at the Clark-Nevada County line.

During the night of June 10–11, 2010 a flash flood along Little Missouri killed 20 people[5] including 8 children who were camping in the campgrounds of the Albert Pike Recreational Area.