American Cruise Lines
The line operates twelve small cruise ships along the Eastern Seaboard and Western Seaboard ( including Alaska ) as well as the Mississippi-Ohio and Columbia-Snake river systems of the United States . 
<triplet> Mississippi <subj> Ohio <obj> tributary <subj> United States <obj> basin country <triplet> Columbia <subj> Snake <obj> tributary <subj> United States <obj> basin country <triplet> Snake <subj> Columbia <obj> mouth of the watercourse <triplet> United States <subj> Alaska <obj> contains administrative territorial entity