Its entire 56.4-mile (90.8 km) length lies within the U.S. state of Kansas.

[3] The Ninnescah River originates in the Wellington Lowlands of south-central Kansas.

It is formed in southwestern Sedgwick County by the confluence of the North Fork Ninnescah River and the South Fork Ninnescah River.

It empties into the Arkansas River roughly 3 miles (4.8 km) north of Oxford, Kansas in eastern Sumner County.

This article related to a river in Kansas is a stub.