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    The Illinois River begins in the Ozark Mountains in the northwest corner of Arkansas and flows west into northeast Oklahoma. Once it enters Oklahoma, it then flows southwest and south through the mountains of eastern Oklahoma into Tenkiller Ferry Lake. The river cuts through steep and rocky bluffs, creating a breathtaking landscape for visitors.
    epa.gov+1

    2 Sources

    Water in Oklahoma | US EPA
    The Illinois River begins in the Ozark Mountains in the northwest corner of Arkansas (Washington County) and flows west into northeast Oklahoma. Once the Illinois River enters Okla…
    U.S. Environmental Protection Agency
    https://www.epa.gov/ok/water-oklahoma
    Illinois River Float Trips and Camping | TravelOK.com - Oklahoma's ...
    Winding through the Cookson Hills of northeastern Oklahoma is a sparkling, 60-miles-plus scenic waterway. The Illinois River cuts through steep and rocky bluffs, creating a breatht…
    TravelOK.com
    https://www.travelok.com/article_page/illinois-river-float-and-camp-trips
    epa.gov
    travelok.com
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