Sebastian County Sheriff's Capt. Philip Pevehouse says the body was found Tuesday afternoon in the Vache Grasse Public Access area near Lavaca.
Pevehouse says the body is being sent to the state Crime Lab to determine the cause of death.
He says the person's name is not being released, but said it is not either of two people missing since a boating accident in the river on Sunday in neighboring Le Flore County, Oklahoma.
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