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  1. Ar·kan·sas Riv·er
    IPA[ˌärkənsô ˈrivər]
    • 1. a river in the southwestern US, which flows for 1,450 miles (2,320 km) from the Rockies in Colorado to join the Mississippi River in Arkansas. It has been made navigable for oceangoing vessels as far west as Tulsa, Oklahoma.