There are 13 river systems in Illinois and 1 that runs into Illinois.
The 13 rivers in Illinois are:
The Rock River is in northwestern corner of the state.
The Fox, Des Plaines, and Kankakee Rivers are bunched together in the northeastern corner of Illinois.
The Illinois River is formed when the Fox and Des Plaines merge (the Kankakee River has already merged with the Des Plaines River). The Illinois River runs from the northeastern corner of Illinois to the western border of Illinois.
The Sangamon River, which also merges with the Illinois River, runs in the middle of Illinois.
The Embarras River runs near the southern border of Illinois and merges with the Wabash River to form a segment of the state border.
The Wabash River is the river that creates the southern border between Illinois and Indiana.
The Litttle Wabash River runs near the southern border and merges with the Wabash River.
The Kaskaskia River runs in the southern portion of the state and merges with the Mississippi River.
The Mississippi River flows north to south and is the western border of Illinois.
The Missouri River does not flow in Illinois, but it flows into the Mississippi in the southern area of Illinois' western border.
The Ohio River runs into Illinois from the east and forms the southeast border of Illinois.
The Big Muddy River flows in the southern point of Illinois.
Click here for the river systems of Illinois quiz