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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

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15y ago
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9y ago

The longest river in Illinois is the Illinois River. The river is approximately 273 long and is contained inside the state of Illinois.

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12y ago

7 borders

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4y ago
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Q: How long is Illinois borders?
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