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The Kaskaskia River (325 miles) is the longest entirely within the state, although the Illinois River has a larger drainage area. The Kaskaskia was once 10 miles longer, but its original lower watercourse became part of the Mississippi River after flooding in 1881, cutting off the town of Kaskaskia on the western bank.

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14y ago

The Father of All Waters.

the mighty Mississippi River

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Q: What is the largest river wholly within Illinois?
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