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The Ohio River<\/a> begins at Pittsburgh, with the union of the Allegheny and Monongahela rivers. From there the Ohio travels 981 miles to Cairo, Illinois, where it joins the Mississippi.<\/p>\n\n <\/div>\n\n \n \n \n <\/div>\n\n \n \n <\/div>\n <\/div>\n\n <\/div>\n <\/div>\n<\/div>\n\n