Barn Door Hills
The hills are an outlying section of the narrow , linear Metacomet Ridge that extends from Long Island Sound near New Haven , north through the Connecticut River Valley of Massachusetts to the Vermont border . 
<triplet> Metacomet Ridge <subj> Massachusetts <obj> located in the administrative territorial entity <triplet> Long Island Sound <subj> Connecticut River Valley <obj> tributary <triplet> Connecticut River Valley <subj> Massachusetts <obj> located in the administrative territorial entity <triplet> Massachusetts <subj> Vermont <obj> shares border with <triplet> Vermont <subj> Massachusetts <obj> shares border with