Mountain Fork, also known as the Mountain Fork of the Little River, is a 98-mile-long (158 km)[1] tributary of the Little River in western Arkansas and southeastern Oklahoma in the United States. Via the Little and Red rivers, it is part of the watershed of the Mississippi River.
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It rises in Le Flore County, Oklahoma, in the Ouachita Mountains, and flows southeastwardly into Polk County, Arkansas, then southwestwardly into McCurtain County, Oklahoma, where it turns southward for the remainder of its course. It joins the Little River in McCurtain County, 10 miles (16 km) southeast of Broken Bow.
In its upper course, the river flows through a portion of the Ouachita National Forest. In McCurtain County, the river is dammed to form Broken Bow Lake.