Nemaha River

Name of two rivers in southern Nebraska. The Big Nemaha River (length 64 km/40 mi) begins just west of Falls City in the southeast of the state and flows east to the Missouri River just north of the Kansas border. The Little Nemaha River (length 145 km/90 mi) follows a southeasterly course roughly parallel to, but some 32 km/20 mi northeast of, the Big Nemaha, entering the Missouri just southeast of the village of Nemaha, Nebraska; population (1990) 188.

The Big Nemaha is formed by the confluence of its 152 km/95 mi-long North Fork and 109 km/68 mi-long South Fork. The North Fork rises 24 km/15 mi south of Lincoln and flows generally southeast. The South Fork rises near Seneca in northeastern Kansas, and flows north and then east to the junction.