270 miles (434 kilometers).
The Illinois River flows through Illinois, from the northeast of the state at the end of the Kankakee River and the Des Plaines River in Grundy County and flowing down 270 miles to the southwest, where it meets the Mississippi River
The longest river in Illinois is the Illinois River. The river is approximately 273 long and is contained inside the state of Illinois.
7 borders
The capital of Indiana, which is a state that borders Illinois is Indianapolis.
The Mississippi River borders Illinois on the west.
Lake Michigan forms the northeastern border of the State of Illinois.
Illinois has some body of water on most borders. Three bodies of water that form borders of Illinois are the Mississippi River, Lake Michigan, and The Ohio River.
Illinois shares land borders with several other US states and one of the Great Lakes, but does not share a border with another country. It is possible, though, to travel by boat from Illinois to Canada.
Illinois borders Indiana to the west.
Illinois borders the Mississippi River to the west.
Indiana borders Lake Michigan to the northwest, Michigan to the north, Ohio to the east, Kentucky to the south and southeast, and Illinois to the west.
Illinois does not border the Gulf of Mexico. Illinois borders Lake Michigan.
Michigan, Ohio, Kentucky, and Illinois border Indiana.
Illinois
Mississippi