Concord River
The Concord River is a tributary of the Merrimack River in eastern Massachusetts in the United States . 
<triplet> Concord River <subj> Merrimack River <obj> mouth of the watercourse <subj> Massachusetts <obj> located in the administrative territorial entity <triplet> Merrimack River <subj> Concord River <obj> tributary <subj> Massachusetts <obj> located in the administrative territorial entity