Physical Geography

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Entries - Entry Category: Physical Geography - Starting with I

Illinois River

Flowing through the Ozark borderlands of eastern Oklahoma and western Arkansas, the Illinois River is fed by 1,660 square miles of drainage area and serves as the primary tributary for the largest lake in eastern Oklahoma, Tenkiller Ferry Reservoir. The Illinois has historically represented an area of significant economic importance and ecological convergence between the hilly Ozarks and the southern plains. The watershed of the Illinois River comprises five counties in Oklahoma and Arkansas, providing more than 100 miles of recreational opportunities. The Illinois River system consists of the Illinois and its tributaries, Flint and Baron Fork creeks, both of which are major tourist destinations for the south-central United States and provide a substantial portion of tourism income for the …