Illinois River (Arkansas–Oklahoma)

General data
- Name: Illinois River (Arkansas–Oklahoma)
- Water system: Mississippi River
- Water type: River
- Progression: Arkansas River -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
The Illinois River is a 145-mile-long (233 km) tributary of the Arkansas River in the U.S. states of Arkansas and Oklahoma. The state of Oklahoma has designated its portion as a Scenic River.